adaptive image path has a white space character

The function adaptive_image_resolution($resolutions) get a break point with a white space, and return a resolution string with a space. .e.g. ' 480'.
Finally, we get a image url with a white space character. e.g. 'http://example.com/sites/default/files/styles/image_style/public/slidesh... 1260/picture.png' (there is a space before "1260").
Surely, the module can still get the image path correct, but with a ugly url.

The patch can fix it.