Catch error when manual kerning encountered

Windell Oskayrequested to merge
issue_456 into master

What does the merge request do?

Catches an error that could cause a traceback, when rendering regular text containing manual kerning. In this case, we now catch the error and warn the user that they should use the Remove Manual Kerns menu command.

Closes issue #456 (closed)

Summary for release notes

Fix a bug in the Hershey Text extension where an error was not handled correctly.

Checklist

  • No changes to unit tests
  • No changes to inkex/
  • Clean merge request history

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