Add uncaught exception handler to message retrieval thread

Related #6644
// FREEBIE

src/org/thoughtcrime/securesms/service/MessageRetrievalService.java

@@ -182,10 +182,14 @@ public class MessageRetrievalService extends Service implements InjectableType,
     return pipe;
   }
 
-  private class MessageRetrievalThread extends Thread {
+  private class MessageRetrievalThread extends Thread implements Thread.UncaughtExceptionHandler {
 
     private AtomicBoolean stopThread = new AtomicBoolean(false);
 
+    MessageRetrievalThread() {
+      setUncaughtExceptionHandler(this);
+    }
+
     @Override
     public void run() {
       while (!stopThread.get()) {
@@ -235,5 +239,11 @@ public class MessageRetrievalService extends Service implements InjectableType,
     public void stopThread() {
       stopThread.set(true);
     }
+
+    @Override
+    public void uncaughtException(Thread t, Throwable e) {
+      Log.w(TAG, "*** Uncaught exception!");
+      Log.w(TAG, e);
+    }
   }
 }