mvdkleijn/tinymce — pull request #2 by marekmurawski (2012-03-03 17:36:18+00:00)
Title: Added a line of code to remove the first comma at the beginning of Array...

... definition:

var tinyMCEImageList = new Array(,["/public/images/subfolder1/image1.jpg ...

That situation happens if you have no images in the root directory of images for TinyMCE