Make _blankGif a String rather than a dojo.moduleURL() Object, since it's referenced as a string in many places, from code like img.src = this._blankGif.
Make _blankGif a String rather than a dojo.moduleURL() Object,
since it's referenced as a string in many places, from code like
img.src = this._blankGif.

Fixes #9116 !strict.

git-svn-id: 674a2d6b1e32e53f607eb824547723f32280967e@17378 560b804f-0ae3-0310-86f3-f6aa0a117693

redaktor/deliteful