img: only provide alt text if it was specified

if suitable alternate text is unknown, then it should not be given.
empty alt text is suitable mainly for purely decorative images.
(cherry picked from commit 3cd7f67f0cf894f4fd5ba16f68e82e4f7bdbfdc5)

diff --git a/IkiWiki/Plugin/img.pm b/IkiWiki/Plugin/img.pm
index 5c580c03cec01a5c4529fefd9f207702e0306d58..d295b833b21b57ccfef5c5d985ae91281efb466b 100644 (file)
--- a/IkiWiki/Plugin/img.pm
+++ b/IkiWiki/Plugin/img.pm
@@ -119,9 +119,9 @@ sub preprocess (@) {
        }
 
        my $imgtag='<img src="'.$imgurl.
-               '" alt="'.(exists $params{alt} ? $params{alt} : '').
                '" width="'.$im->Get("width").
                '" height="'.$im->Get("height").'"'.
+               (exists $params{alt} ? '" alt="'.$params{alt}.'"' : '').
                (exists $params{title} ? ' title="'.$params{title}.'"' : '').
                (exists $params{class} ? ' class="'.$params{class}.'"' : '').
                (exists $params{id} ? ' id="'.$params{id}.'"' : '').