NPE when clicking on popup items after triggering system split screen

[amaze-issue-automation[bot]]

Issue explanation (write below this line)

Exception

• App Name: Amaze File Manager
• Package: com.amaze.filemanager
• Version: 3.6.1
• User Action: UI Error
• Request: Application crash
• OS: Linux Android 8.1.0 - 27
• Device: TB-8704X
• Model: Lenovo TB-8704X
• Product: TB-8704X
  Crash log

java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.Context android.app.Activity.getApplicationContext()' on a null object reference at com.amaze.filemanager.ui.dialogs.GeneralDialogCreation.showPropertiesDialog(GeneralDialogCreation.java:425) at com.amaze.filemanager.ui.dialogs.GeneralDialogCreation.showPropertiesDialogWithPermissions(GeneralDialogCreation.java:403) at com.amaze.filemanager.ui.ItemPopupMenu.onMenuItemClick(ItemPopupMenu.java:93) at android.widget.PopupMenu$1.onMenuItemSelected(PopupMenu.java:105) at com.android.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:761) at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:167) at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:908) at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:898) at com.android.internal.view.menu.MenuPopup.onItemClick(MenuPopup.java:128) at android.widget.AdapterView.performItemClick(AdapterView.java:318) at android.widget.AbsListView.performItemClick(AbsListView.java:1181) at android.widget.AbsListView$PerformClick.run(AbsListView.java:3150) at android.os.Handler.handleCallback(Handler.java:790) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:164) at android.app.ActivityThread.main(ActivityThread.java:6518) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)

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Reporter: shuvashish76

[shuvashish76]

https://user-images.githubusercontent.com/48226312/131077786-f1151ad4-855b-46a9-84c5-ed10d0ec2ca9.mp4

https://github.com/zhanghai/MaterialFiles/issues/574

[VishnuSanal]

This happens when any option is selected from the popup menu - making it high-priority