`NullPointerException: USB OTG root not set!` on `OTGUtil#getDocumentFile`

[amaze-issue-automation[bot]]

Issue explanation (write below this line)

Exception

• App Name: Amaze File Manager
• Package: com.amaze.filemanager
• Version: 3.8.5
• User Action: UI Error
• Request: Application crash
• OS: Linux Android 5.1 - 22
• Device: TB3-710I
• Model: Lenovo TB3-710I
• Product: LenovoTB3-710I
  Crash log

java.lang.NullPointerException: USB OTG root not set!
at com.amaze.filemanager.utils.OTGUtil.getDocumentFile(OTGUtil.kt:157)
at com.amaze.filemanager.filesystem.HybridFile.getTotal(HybridFile.java:922)
at
com.amaze.filemanager.ui.views.drawer.Drawer.refreshDrawer(Drawer.java:308)
at
com.amaze.filemanager.ui.activities.MainActivity$1.onComplete(MainActivity.java:428)
at
io.reactivex.internal.operators.completable.CompletableObserveOn$ObserveOnCompletableObserver.run(CompletableObserveOn.java:89)
at
io.reactivex.android.schedulers.HandlerScheduler$ScheduledRunnable.run(HandlerScheduler.java:124)
at android.os.Handler.handleCallback(Handler.java:815)
at android.os.Handler.dispatchMessage(Handler.java:104)
at android.os.Looper.loop(Looper.java:194)
at android.app.ActivityThread.main(ActivityThread.java:5637)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:960)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)

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[VishnuSanal]

dupe #2213? @TranceLove