fixed some dialogue events with hostile creatures causing a crash. — CulixCupric's Temeritus: Dark Scion Steam update #823376

fixed some dialogue events with hostile creatures causing a crash. crash was reported for goblins, but the nature of the bug lead to a more simple fix to the dialogue step system that was causing the bug under certain circumstances, mainly some dialogues with only a close option did not properly link and would throw a nonexistent struct call. patched now, with an !is_undefined prior to the choice.run_code ^w^