[Android] Kotlin nullability cleanup

[Geoffrey Métais]

vlc-android | branch: master | Geoffrey Métais <geoffrey.metais at gmail.com> | Tue May  7 16:07:00 2019 +0200| [79a264239b4de90f07b9dfa42f666e948ac9f2f4] | committer: Geoffrey Métais

Kotlin nullability cleanup

> https://code.videolan.org/videolan/vlc-android/commit/79a264239b4de90f07b9dfa42f666e948ac9f2f4
---

 .../src/org/videolan/vlc/gui/HistoryFragment.kt    | 74 +++++++++---------
 .../videolan/vlc/gui/audio/AudioBrowserFragment.kt |  4 +-
 .../org/videolan/vlc/gui/audio/BaseAudioBrowser.kt |  4 +-
 .../vlc/gui/browser/BaseBrowserFragment.kt         | 16 ++--
 .../vlc/gui/browser/FileBrowserFragment.kt         |  4 +-
 .../vlc/gui/browser/MediaBrowserFragment.kt        | 87 +++++++---------------
 .../vlc/gui/browser/NetworkBrowserFragment.kt      |  4 +-
 .../vlc/gui/browser/StorageBrowserFragment.kt      | 13 ++--
 .../videolan/vlc/gui/folders/FoldersFragment.kt    |  6 +-
 .../videolan/vlc/gui/video/VideoGridFragment.kt    | 14 ++--
 .../org/videolan/vlc/viewmodels/HistoryModel.kt    |  4 -
 11 files changed, 89 insertions(+), 141 deletions(-)

Diff:   https://code.videolan.org/videolan/vlc-android/commit/79a264239b4de90f07b9dfa42f666e948ac9f2f4