Built-in string for vertex shaders can be empty. Nicolas handled this case in r433 but r437 overwrote it.
Review URL: http://codereview.appspot.com/2233046

git-svn-id: http://angleproject.googlecode.com/svn/trunk@439 736b8ea6-26fd-11df-bfd4-992fa37f6226
1 file changed