glslang front-end: Don't emit blank lines for empty info logs. From Andrew Woloszyn <awoloszyn@google.com>.

git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@31531 e7fa87d3-cd2b-0410-9028-fcbf551c1848