Don't use isset() to check whether an existing variable is null

Change-Id: I05ad172f69189cbef86c65d5990e76edbedfd7c6

diff --git a/includes/UserMailer.php b/includes/UserMailer.php
index fe80929..4d8fce8 100644 (file)
--- a/includes/UserMailer.php
+++ b/includes/UserMailer.php
@@ -276,7 +276,7 @@ class UserMailer {
                                $headers = $mime->headers( $headers );
                        }
                }
-               if ( !isset( $mime ) ) {
+               if ( $mime === null ) {
                        // sending text only, either deliberately or as a fallback
                        if ( wfIsWindows() ) {
                                $body = str_replace( "\n", "\r\n", $body );