Fall back to Camera1Enumerator on exceptions

If Camera2Enumerator.isSupported() throws, consider Camera2Enumerator to
not be supported, log the Throwable, and use Camera1Enumerator instead.

Before this patch, an exception thrown by Camera2Enumerator.isSupported
would crash any Signal call (even if video was not enabled).

Fixes #6537
// FREEBIE

src/org/thoughtcrime/securesms/webrtc/PeerConnectionWrapper.java

@@ -273,11 +273,18 @@ public class PeerConnectionWrapper {
   }
 
   private @Nullable CameraVideoCapturer createVideoCapturer(@NonNull Context context) {
-    Log.w(TAG, "Camera2 enumerator supported: " + Camera2Enumerator.isSupported(context));
+    boolean camera2EnumeratorIsSupported = false;
+    try {
+      camera2EnumeratorIsSupported = Camera2Enumerator.isSupported(context);
+    } catch (final Throwable throwable) {
+      Log.w(TAG, "Camera2Enumator.isSupport() threw.", throwable);
+    }
+
+    Log.w(TAG, "Camera2 enumerator supported: " + camera2EnumeratorIsSupported);
     CameraEnumerator enumerator;
 
-    if (Camera2Enumerator.isSupported(context)) enumerator = new Camera2Enumerator(context);
-    else                                        enumerator = new Camera1Enumerator(true);
+    if (camera2EnumeratorIsSupported) enumerator = new Camera2Enumerator(context);
+    else                              enumerator = new Camera1Enumerator(true);
 
     String[] deviceNames = enumerator.getDeviceNames();