[Android] Fix thumbnail generation crash

[Nicolas Pomepuy]

vlc-android | branch: master | Nicolas Pomepuy <nicolas.pomepuy at gmail.com> | Fri Apr 19 11:35:25 2019 +0200| [10f9cb471ca30a3b119c74751eab8c79c71b228f] | committer: Geoffrey Métais

Fix thumbnail generation crash

> https://code.videolan.org/videolan/vlc-android/commit/10f9cb471ca30a3b119c74751eab8c79c71b228f
---

 vlc-android/src/org/videolan/vlc/util/ThumbnailsProvider.kt | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/vlc-android/src/org/videolan/vlc/util/ThumbnailsProvider.kt b/vlc-android/src/org/videolan/vlc/util/ThumbnailsProvider.kt
index 39950f7b1..ff582d860 100644
--- a/vlc-android/src/org/videolan/vlc/util/ThumbnailsProvider.kt
+++ b/vlc-android/src/org/videolan/vlc/util/ThumbnailsProvider.kt
@@ -207,10 +207,8 @@ object ThumbnailsProvider {
             }
         }
         if (count == 0) return null
-        val sources = Array(sourcesImages.size) {
-            sourcesImages[it]!!
-        }
-        return if (count == 1) sourcesImages[0] else composeCanvas(sources, count, minWidth, minHeight)
+
+        return if (count == 1) sourcesImages[0] else composeCanvas(sourcesImages.filterNotNull().toTypedArray(), count, minWidth, minHeight)
     }
 
     private fun composeCanvas(sourcesImages: Array<Bitmap>, count: Int, minWidth: Int, minHeight: Int): Bitmap {