Unbinding quicksave causes Save/Load window to not function

[LeakingAmps]

Describe the bug When using the Options->Keybinds menu and unbinding the Quicksave option, selecting Save/Load on the menu causes it to appear to do nothing, and dump an error in the log.

Expected behavior Changing or removing a keybind to not affect the availability of menus.

To Reproduce Please include the steps that need to be taken in order to reproduce the bug. e.g.:

1. Go to the Keybinding menu
2. Click on the X next to the bind to unbind it
3. Back out to the main menu
4. Attempt to open the Save/Load menu

Additional information:

• Game version 0.4.9.9
• OS: Windows 10
• Using .jar or .exe: exe

Error Log:

Game Version: 0.4.9.9
Java: 1.8.0_172 (Oracle Corporation)
OS: Windows 10 (amd64)
Mod folders present: innoxia
java.lang.NullPointerException
    at com.lilithsthrone.game.dialogue.utils.OptionsDialogue$2.getHeaderContent(OptionsDialogue.java:350)
    at com.lilithsthrone.game.Game.setContent(Game.java:3424)
    at com.lilithsthrone.controller.eventListeners.SetContentEventListener.handleEvent(SetContentEventListener.java:36)
    at com.sun.webkit.dom.EventListenerImpl.fwkHandleEvent(EventListenerImpl.java:129)
    at com.sun.webkit.WebPage.twkProcessMouseEvent(Native Method)
    at com.sun.webkit.WebPage.dispatchMouseEvent(WebPage.java:807)
    at javafx.scene.web.WebView.processMouseEvent(WebView.java:1045)
    at javafx.scene.web.WebView.lambda$registerEventHandlers$32(WebView.java:1168)
    at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
    at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
    at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
    at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
    at javafx.event.Event.fireEvent(Event.java:198)
    at javafx.scene.Scene$MouseHandler.process(Scene.java:3757)
    at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
    at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
    at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:394)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$353(GlassViewEventHandler.java:432)
    at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:431)
    at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
    at com.sun.glass.ui.View.notifyMouse(View.java:937)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)
    at java.lang.Thread.run(Unknown Source)