Fixed null dereference when null passed as attribute list to eglCreateContext.

I tested that the samples still work and that they fail as expected, but do not crash, if the attribute list argument is null.

Review URL: http://codereview.appspot.com/2725042

git-svn-id: http://angleproject.googlecode.com/svn/trunk@471 736b8ea6-26fd-11df-bfd4-992fa37f6226
1 file changed