Fixing a PHP error

git-svn-id: https://plugins.svn.wordpress.org/theme-tweaker-lite/trunk@889777 b8457f37-d9ea-0310-8a92-e5e31aec5664
Committing V4.21: Major coding and translation improvements. [Apr 8, 2014]

git-svn-id: https://plugins.svn.wordpress.org/theme-tweaker-lite/trunk@889779 b8457f37-d9ea-0310-8a92-e5e31aec5664