* empty() => ''

diff --git a/includes/SpecialBooksources.php b/includes/SpecialBooksources.php
index 85a8178..d582ed8 100644 (file)
--- a/includes/SpecialBooksources.php
+++ b/includes/SpecialBooksources.php
@@ -39,7 +39,7 @@ class BookSourceList {
                global $wgOut;
 
                $wgOut->setPagetitle( wfMsg( "booksources" ) );
-               if( empty( $this->mIsbn ) ) {
+               if( $this->mIsbn == '' ) {
                        $this->askForm();
                } else {
                        $this->showList();