Bastien Montagne 57eb8539fc Fix crash (segfault) in node editor.
In some cases, we can have nodegroups without attached nodetree, this case is checked
in top `node_group_has_output()` entry point, but not in recursive `node_group_has_output_dfs()`.

Issue appeared after rB42824f4403db3a35, presumably because check on node flag itself
was skipping that case, which is no more possible when using ID tags.

Reported by sebastian_k over IRC, thanks.
2016-04-29 17:37:00 +02:00
2016-01-04 14:20:48 +05:00
2016-04-24 00:16:44 +10:00
2016-02-10 00:26:12 +11:00
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