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Albert Gräf authored
The crash was being triggered by last_thing being null when the append callback was invoked. I noticed this, e.g., with ELSE's else and message help patches, which otherwise look pretty innocent. So it seems that last_thing *can* in fact be null when the append callback is being invoked in certain situations. Whatever the cause may be, the canvas gui crashing is definitely *not* an acceptable outcome in *any* situation. This commit deals with that condition by effectively turning the operation into a no-op, which seems to be the only thing that we can possibly do in this case.
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