The source project of this merge request has been removed.
Explicitly set image alt to prevent graphical glitches
Rails image_tag sets the alt-attribute to the filename which causes graphical glitches if the file could not be loaded.
Fixes https://github.com/gitlabhq/gitlabhq/issues/6036.
Signed-off-by: Sven Strickroth email@cs-ware.de