I think we should be able do trim the options list in makeImage, but I'm not
100% positive it won't affect other things, so I'll not commit, but just post
the patch here for another developer to look over. It should fix your problem,
however:

Index: Parser.php

• Parser.php (revision 19123)

+++ Parser.php (working copy)
@@ -4373,7 +4373,7 @@

1. * center center the image
2. * framed Keep original image size, no magnify-button.

• $part = explode( '|', $options);

+ $part = array_map( 'trim', explode( '|', $options) );

$mwThumb  =& MagicWord::get( 'img_thumbnail' );
$mwManualThumb =& MagicWord::get( 'img_manualthumb' );

Seems okay after sitting on it awhile, applied in r20540