Adjust error message to be clearer for empty var

diff --git a/includes/Preferences.php b/includes/Preferences.php
index 9db5366..279b1a8 100644 (file)
--- a/includes/Preferences.php
+++ b/includes/Preferences.php
@@ -57,7 +57,7 @@ class Preferences {
                        } elseif( $field->validate( $globalDefault, $user->mOptions ) === true ) {
                                $info['default'] = $globalDefault;
                        } else {
-                               throw new MWException( "Global default $globalDefault is invalid for field $name" );
+                               throw new MWException( "Global default '$globalDefault' is invalid for field $name" );
                        }
                }