Empty title attributes being matched for captions

Image caption filter was incorrectly matching empty title attributes that are created in image tags that are added to WYSIWYG editors when using the Insert module. The attribute title="" was matched by the regex on line 107 of the module, causing some of the image tag's attribute code to show up as an unwanted caption.

I was able to solve the problem by adding the following code before line 107 to remove the empty title attributes:

// remove blanks
$img_tag = preg_replace('/title=\"\"/i','',$img_tag);

There might be a better way to address the problem by rewriting the regex on line 107, but I am actually a designer and not a developer and therefore don't know much about regex. Or creating and posting patches, for that matter. I humbly request that someone with more skillz address this issue.