Publisher: Remove pyblish exception log from records

[iLLiCiTiT]

Changelog Description

Remove exception from log records.

Additional info

Pyblish process method is logging exception which is added to records of our custom message handler.

Testing notes:

1. Validation error does not add error log to logs with traceback.

Resolves #937

[BigRoy]

This does fix the issue:

But I'd consider it a hotfix really. We would really want to preferably 'catch' this differently if we can because it feels relatively hacky to just pick the last log entry and discard it like this. So maybe a # TODO alongside this in the code would be nice so we can keep it in mind for if we can think of better solutions.

[iLLiCiTiT]

But I'd consider it a hotfix really. We would really want to preferably 'catch' this differently if we can because it feels relatively hacky to just pick the last log entry and discard it like this.

Only proper solution to fix this is to not use pyblish.