Better check and handing of user deletion

lib/user.php

@@ -216,7 +216,7 @@ class OC_User {
 
 			// Emit and exit
 			OC_Hook::emit( "OC_User", "post_deleteUser", array( "uid" => $uid ));
-			return true;
+			return !self::userExists($uid);
 		}
 		else{
 			return false;

settings/js/users.js

@@ -59,6 +59,8 @@ var UserList={
 						if (ready) {
 							ready();
 						}
+					} else {
+						oc.dialogs.alert(result.data.message, t('settings', 'Unable to remove user'));
 					}
 				}
 			});