fixed issue when no quotas are found

lam/lib/modules/quota.inc

@@ -663,6 +663,9 @@ class quota extends baseModule {
 			$remote->disconnect();
 			$dirs = explode(":", $quotas);
 			array_pop($dirs); // remove empty element at the end
+			if (empty($dirs)) {
+				continue;
+			}
 			for ($i = 0; $i < sizeof($dirs); $i++) {
 				if (strpos($dirs[$i], self::$QUOTA_PREFIX) !== 0) {
 					unset($dirs[$i]);