Author: Aparup Banerjee
MDL-42711 hide course theme option for non bootstrapbase based themes. some other minor fixes too.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=b661e76c3f7132a30cadadf7c21eccf419a3adac
http://github.com/moodle/moodle/commit/b661e76c3f7132a30cadadf7c21eccf419a3adac
+ 2.6 en [coursetheme,mod_chat]