Merge branch 'master' of http://git.roojs.com/roobuilder

diff --cc src/Palete/ValaSource.vala
index 7aa4530,cf0de86..f3678c3
--- 1/src/Palete/ValaSource.vala
--- 2/src/Palete/ValaSource.vala
+++ b/src/Palete/ValaSource.vala
@@@ -271,12 -270,12 +271,16 @@@ namespace Palete 
                        
                        var m = pr.firstBuildModule();
                        var cg = pr.compilegroups.get(m);
+ 
+       if (cg == null) {
+           return false;
+       }
                        var foundit = false;
 -                      for (var i = 0; i < cg.sources.size; i++) {
 +                      
 +            if (cg.sources is null) {
 +                return false;
 +            }
 +            for (var i = 0; i < cg.sources.size; i++) {
                            var path = pr.resolve_path(
                                    pr.resolve_path_combine_path(pr.firstPath(),cg.sources.get(i)));
                            if (path == file.path) {