Adds missing NULL checks where in similiar situation at other places we already have NULL checks.
Created attachment 10683 [details] [review] Adds the NULL checks
Created attachment 10684 [details] [review] Fixes last patch (a mem leak was introduced there)
Third part, file src/screen.c got just applied from here: http://bugs.opencompositing.org/show_bug.cgi?id=236 First and second part still open.
Created attachment 10926 [details] [review] Renewed patch, applicable...
The change to src/screen.c has already been applied and the patch is adding a duplicate check. I've applied the other changes. Thanks.
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