fixed multiple calls of ConnectivityActionReceiver

src/com/owncloud/android/files/services/ConnectivityActionReceiver.java

@@ -61,7 +61,7 @@ public class ConnectivityActionReceiver extends BroadcastReceiver {
             ConnectivityManager cm =
                     (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
             NetworkInfo networkInfo = cm.getActiveNetworkInfo();
-            if(networkInfo.getType() == ConnectivityManager.TYPE_WIFI &&
+            if(networkInfo == null || networkInfo.getType() == ConnectivityManager.TYPE_WIFI &&
                 ! networkInfo.isConnected()) {
                 Log.d(TAG, "Wifi is disconnected: " + String.valueOf(networkInfo));
                 wifiDisconnected(context);

src/com/owncloud/android/files/services/FileUploadService.java

@@ -253,6 +253,7 @@ public class FileUploadService extends IntentService {
             mDb.updateUpload(uploadDbObject);   
         }
         
+        //TODO This service can be instantiated at any time. Move this retry call to start of app.
         if(InstantUploadBroadcastReceiver.isOnline(getApplicationContext())) {
             Log_OC.d(TAG, "FileUploadService.retry() called by onCreate()");
             FileUploadService.retry(getApplicationContext());