NullPointerException on getSystemUiVisibility()

[73k05]

Hi,

I've got this crash from the community:

Fatal Exception: java.lang.NullPointerException
Attempt to invoke virtual method 'int android.view.View.getSystemUiVisibility()' on a null object reference
com.greentoad.turtlebody.imagepreview.ImagePreview$PreviewFragment.hide (ImagePreview.java:336)
com.greentoad.turtlebody.imagepreview.ImagePreview$PreviewFragment.access$hide (ImagePreview.java:211)
com.greentoad.turtlebody.imagepreview.ImagePreview$PreviewFragment$initAdapter$2.onViewPagerClick (ImagePreview.java:374)
com.greentoad.turtlebody.imagepreview.ui.components.ViewPagerAdapter$getItem$1.onImageClick (ViewPagerAdapter.java:28)
com.greentoad.turtlebody.imagepreview.ui.components.ImageFragmentViewer.onViewCreated$lambda-0 (ImageFragmentViewer.java:66)
com.greentoad.turtlebody.imagepreview.ui.components.ImageFragmentViewer.lambda$RLwMrkVqeHGudG0blsm2jYqcBfU (ImageFragmentViewer.java)
com.greentoad.turtlebody.imagepreview.ui.components.-$$Lambda$ImageFragmentViewer$RLwMrkVqeHGudG0blsm2jYqcBfU.onClick (-.java:2)
android.view.View.performClick (View.java:6897)
com.davemorrissey.labs.subscaleview.SubsamplingScaleImageView$2.onSingleTapConfirmed (SubsamplingScaleImageView.java:565)
android.view.GestureDetector$GestureHandler.handleMessage (GestureDetector.java:312)
com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1374)

I fixed it in this PR #15

Regards
73k05