Note NPE Check

[alperozturk96]

java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String it.niedermann.owncloud.notes.persistence.entity.Note.getTitle()' on a null object reference
at it.niedermann.owncloud.notes.edit.BaseNoteFragment.showEditTitleDialog([BaseNoteFragment.java:415](http://basenotefragment.java:415/))
at it.niedermann.owncloud.notes.edit.EditNoteActivity.lambda$onCreate$1([EditNoteActivity.java:107](http://editnoteactivity.java:107/))
at it.niedermann.owncloud.notes.edit.EditNoteActivity.$r8$lambda$UJedk4LvKj9WQr-SP36V1yjU2So(Unknown Source:0)
at it.niedermann.owncloud.notes.edit.EditNoteActivity$$ExternalSyntheticLambda2.onClick(D8$$SyntheticClass:0)
at android.view.View.performClick([View.java:8083](http://view.java:8083/))
at android.view.View.performClickInternal([View.java:8060](http://view.java:8060/))
at android.view.View.-$$Nest$mperformClickInternal(Unknown Source:0)
at android.view.View$PerformClick.run([View.java:31549](http://view.java:31549/))
at android.os.Handler.handleCallback([Handler.java:995](http://handler.java:995/))
at android.os.Handler.dispatchMessage([Handler.java:103](http://handler.java:103/))
at android.os.Looper.loopOnce([Looper.java:248](http://looper.java:248/))
at android.os.Looper.loop([Looper.java:338](http://looper.java:338/))
at [android.app](http://android.app/).ActivityThread.main([ActivityThread.java:9067](http://activitythread.java:9067/))
at java.lang.reflect.Method.invoke(Native Method)
at [com.android](http://com.android/).internal.os.RuntimeInit$MethodAndArgsCaller.run([RuntimeInit.java:593](http://runtimeinit.java:593/))
at [com.android](http://com.android/).internal.os.ZygoteInit.main([ZygoteInit.java:932](http://zygoteinit.java:932/))

[alperozturk96]

/backport to stable-4.4