Merge pull request #1897 from annando/3.4.2

Bugfix: Following mail accounts is now possible again

include/Scrape.php

@@ -819,7 +819,9 @@ function probe_url($url, $mode = PROBE_NORMAL, $level = 1) {
 		}
 	}
 
-	Cache::set("probe_url:".$mode.":".$url,serialize($result), CACHE_DAY);
+	// Only store into the cache if the value seems to be valid
+	if ($result['network'] != NETWORK_FEED)
+		Cache::set("probe_url:".$mode.":".$url,serialize($result), CACHE_DAY);
 
 	return $result;
 }