Android: release semaphore when the pending runnable causes an exception

Change-Id: Ide727dd5ceb987bdd4a093e6ee4f9c6b980f5ded
Reviewed-by: BogDan Vatra <bogdan@kdab.com>

src/android/jar/src/org/qtproject/qt5/android/QtThread.java

@@ -84,9 +84,12 @@ public class QtThread {
             m_pendingRunnables.add(new Runnable() {
                 @Override
                 public void run() {
+                    try {
                         runnable.run();
+                    } finally {
                         sem.release();
                     }
+                }
             });
             m_qtThread.notify();
         }