This is presumably to do with moving the icons from the main org.openntf.nsfodp.eclipse plugin to the .ui one:
java.util.NoSuchElementException: No value present
at java.base/java.util.Optional.get(Optional.java:141)
at org.openntf.nsfodp.eclipse.ui.Activator.initializeImageRegistry(Activator.java:47)
at org.eclipse.ui.plugin.AbstractUIPlugin.getImageRegistry(AbstractUIPlugin.java:248)
at org.openntf.nsfodp.eclipse.ui.Activator.getIconDescriptor(Activator.java:55)
at org.openntf.nsfodp.eclipse.ui.resources.DesignElementNode.getImageDescriptor(DesignElementNode.java:75)
at org.eclipse.ui.model.WorkbenchLabelProvider.getImage(WorkbenchLabelProvider.java:177)
at org.eclipse.ui.internal.navigator.NavigatorContentServiceLabelProvider.findImage(NavigatorContentServiceLabelProvider.java:204)
at org.eclipse.ui.internal.navigator.NavigatorContentServiceLabelProvider.getColumnImage(NavigatorContentServiceLabelProvider.java:112)
at org.eclipse.ui.internal.navigator.NavigatorContentServiceLabelProvider.getImage(NavigatorContentServiceLabelProvider.java:104)
at org.eclipse.ui.internal.navigator.NavigatorDecoratingLabelProvider$StyledLabelProviderAdapter.getImage(NavigatorDecoratingLabelProvider.java:63)
at org.eclipse.jface.viewers.DelegatingStyledCellLabelProvider.getImage(DelegatingStyledCellLabelProvider.java:198)
at org.eclipse.jface.viewers.DecoratingStyledCellLabelProvider.getImage(DecoratingStyledCellLabelProvider.java:171)
at org.eclipse.jface.viewers.DelegatingStyledCellLabelProvider.update(DelegatingStyledCellLabelProvider.java:124)
at org.eclipse.jface.viewers.DecoratingStyledCellLabelProvider.update(DecoratingStyledCellLabelProvider.java:134)
at org.eclipse.jface.viewers.ViewerColumn.refresh(ViewerColumn.java:144)
at org.eclipse.jface.viewers.AbstractTreeViewer.doUpdateItem(AbstractTreeViewer.java:946)
at org.eclipse.jface.viewers.AbstractTreeViewer$UpdateItemSafeRunnable.run(AbstractTreeViewer.java:121)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
at org.eclipse.ui.internal.JFaceUtil.lambda$0(JFaceUtil.java:47)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:174)
at org.eclipse.jface.viewers.AbstractTreeViewer.doUpdateItem(AbstractTreeViewer.java:1024)
at org.eclipse.jface.viewers.StructuredViewer$UpdateItemSafeRunnable.run(StructuredViewer.java:422)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
at org.eclipse.ui.internal.JFaceUtil.lambda$0(JFaceUtil.java:47)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:174)
at org.eclipse.jface.viewers.StructuredViewer.updateItem(StructuredViewer.java:2102)
at org.eclipse.jface.viewers.AbstractTreeViewer.createTreeItem(AbstractTreeViewer.java:840)
at org.eclipse.jface.viewers.AbstractTreeViewer.createChildren(AbstractTreeViewer.java:818)
at org.eclipse.jface.viewers.TreeViewer.createChildren(TreeViewer.java:604)
at org.eclipse.jface.viewers.AbstractTreeViewer.createChildren(AbstractTreeViewer.java:766)
at org.eclipse.jface.viewers.AbstractTreeViewer.handleTreeExpand(AbstractTreeViewer.java:1541)
at org.eclipse.jface.viewers.TreeViewer.handleTreeExpand(TreeViewer.java:889)
at org.eclipse.jface.viewers.AbstractTreeViewer$3.treeExpanded(AbstractTreeViewer.java:1553)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:136)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4406)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1512)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1535)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1520)
at org.eclipse.swt.widgets.TreeItem.sendExpand(TreeItem.java:1032)
at org.eclipse.swt.widgets.Tree.expandItem_expandChildren(Tree.java:1285)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:6541)
at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method)
at org.eclipse.swt.widgets.Widget.callSuper(Widget.java:235)
at org.eclipse.swt.widgets.Widget.mouseDownSuper(Widget.java:1146)
at org.eclipse.swt.widgets.Tree.mouseDownSuper(Tree.java:2150)
at org.eclipse.swt.widgets.Widget.mouseDown(Widget.java:1138)
at org.eclipse.swt.widgets.Control.mouseDown(Control.java:2633)
at org.eclipse.swt.widgets.Tree.mouseDown(Tree.java:2117)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:6076)
at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method)
at org.eclipse.swt.widgets.Widget.callSuper(Widget.java:235)
at org.eclipse.swt.widgets.Widget.windowSendEvent(Widget.java:2158)
at org.eclipse.swt.widgets.Shell.windowSendEvent(Shell.java:2401)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:6200)
at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method)
at org.eclipse.swt.widgets.Display.applicationSendEvent(Display.java:5426)
at org.eclipse.swt.widgets.Display.applicationProc(Display.java:5586)
at org.eclipse.swt.internal.cocoa.OS.objc_msgSend(Native Method)
at org.eclipse.swt.internal.cocoa.NSApplication.sendEvent(NSApplication.java:131)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3807)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1160)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1049)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:155)
at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:660)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:559)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:154)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:150)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:137)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:107)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:401)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:657)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:594)
at org.eclipse.equinox.launcher.Main.run(Main.java:1465)
This is presumably to do with moving the icons from the main org.openntf.nsfodp.eclipse plugin to the .ui one: