Fix potential crash (as seen on Play Store console) when a widget is asked to update but it no longer exists or no config is known for it.

core/src/org/transdroid/core/widget/ListWidgetProvider.java

@@ -62,9 +62,11 @@ public class ListWidgetProvider extends AppWidgetProvider {
 		// Refresh a specific app widget
 		if (intent.hasExtra(EXTRA_REFRESH)) {
 			// Manually requested a refresh for the app widget of which the ID was supplied
-			AppWidgetManager.getInstance(context).updateAppWidget(appWidgetId,
-					buildRemoteViews(context, appWidgetId, applicationSettings.getWidgetConfig(appWidgetId)));
+			RemoteViews views = buildRemoteViews(context, appWidgetId, applicationSettings.getWidgetConfig(appWidgetId));
+			if (views != null) {
+				AppWidgetManager.getInstance(context).updateAppWidget(appWidgetId, views);
 				AppWidgetManager.getInstance(context).notifyAppWidgetViewDataChanged(appWidgetId, R.id.torrents_list);
+			}
 			return;
 		}