Fixed refresh image visualization

SWADroid/res/layout/action_bar.xml

@@ -111,6 +111,9 @@
         android:src="@drawable/title_refresh"
         android:onClick="onRefreshClick"
         android:background="@drawable/title_button"
+        android:scaleType="centerCrop"
+        android:paddingLeft="3dp"
+        android:paddingRight="5dp"
         android:visibility="gone"/>
     
     <ProgressBar

SWADroid/src/es/ugr/swad/swadroid/modules/notifications/Notifications.java

@@ -187,6 +187,8 @@ public class Notifications extends Module {
         pb.setVisibility(View.VISIBLE);
         
 		runConnection();
+		if(!isConnected)
+			onError();
 	}
 
 	/* (non-Javadoc)