Fix console message when parsing cancelled or error occured while parsing

When the parsing was cancelled or there were errors while parsing a message appeared in the console:

QObject::connect(EntityValue, Render_alternate): invalid nullptr pointer

This problem may have a deeper cause.

approved this merge request

@jcollin this fixes the error message in the console, if you want to give it a try.

changed the description

added 3 commits

• 340d9b40...2822f1ff - 2 commits from branch solverstack:master
• 1e99119d - Fix console message when parsing cancelled or error occured while parsing

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approved this merge request

mentioned in commit 4028b3db

merged