check nullability of assistant

[alperozturk96]

Exception java.lang.RuntimeException: Unable to start activity ComponentInfo{com.nextcloud.client/com.owncloud.android.ui.activity.FileDisplayActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'com.owncloud.android.lib.resources.status.CapabilityBooleanType com.owncloud.android.lib.resources.status.OCCapability.getAssistant()' on a null object reference
  at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:4049)
  at android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:4236)
  at android.app.servertransaction.LaunchActivityItem.execute (LaunchActivityItem.java:112)
  at android.app.servertransaction.TransactionExecutor.executeNonLifecycleItem (TransactionExecutor.java:174)
  at android.app.servertransaction.TransactionExecutor.executeTransactionItems (TransactionExecutor.java:109)
  at android.app.servertransaction.TransactionExecutor.execute (TransactionExecutor.java:81)
  at android.app.ActivityThread$H.handleMessage (ActivityThread.java:2637)
  at android.os.Handler.dispatchMessage (Handler.java:107)
  at android.os.Looper.loopOnce (Looper.java:232)
  at android.os.Looper.loop (Looper.java:317)
  at android.app.ActivityThread.main (ActivityThread.java:8751)
  at java.lang.reflect.Method.invoke
  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:580)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:892)
Caused by java.lang.NullPointerException: Attempt to invoke virtual method 'com.owncloud.android.lib.resources.status.CapabilityBooleanType com.owncloud.android.lib.resources.status.OCCapability.getAssistant()' on a null object reference
  at com.owncloud.android.ui.activity.DrawerActivity.checkAssistantBottomNavigationMenu (DrawerActivity.java:328)
  at com.owncloud.android.ui.activity.DrawerActivity.setupDrawer (DrawerActivity.java:274)
  at com.owncloud.android.ui.activity.FileDisplayActivity.onCreate (FileDisplayActivity.kt:281)
  at android.app.Activity.performCreate (Activity.java:9002)
  at android.app.Activity.performCreate (Activity.java:8980)
  at android.app.Instrumentation.callActivityOnCreate (Instrumentation.java:1527)
  at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:4031)

[alperozturk96]

/backport to stable-3.36

[github-actions]

Codacy

SpotBugs

Category	Base	New
Bad practice	42	42
Correctness	75	75
Dodgy code	256	256
Experimental	1	1
Internationalization	7	7
Malicious code vulnerability	2	2
Multithreaded correctness	34	34
Performance	44	44
Security	18	18
Total	479	479

[github-actions]

APK file: https://www.kaminsky.me/nc-dev/android-artifacts/16580.apk



To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.

[github-actions]

blue-Light-Screenshot test failed, but no output was generated. Maybe a preliminary stage failed.