Merge pull request #5550 from owncloud/fix-4716-master

'Update to' is shown when there is no update

lib/private/installer.php

@@ -259,7 +259,7 @@ class OC_Installer{
 	/**
 	 * @brief Check if an update for the app is available
 	 * @param $name name of the application
-	 * @returns empty string is no update available or the version number of the update
+	 * @return boolean false or the version number of the update
 	 *
 	 * The function will check if an update for a version is available
 	 */
@@ -275,11 +275,11 @@ class OC_Installer{
 				return($ocsversion);
 
 			}else{
-				return('');
+				return false;
 			}
 
 		}else{
-			return('');
+			return false;
 		}
 
 	}