What does this implement/fix? Explain your changes.

fix for "handle is not initalized" crash on clr.GetClrType(System.__class__)

Does this close any currently open issues?

#606

Checklist

Check all those that are applicable and complete.

• Make sure to include one or more tests for your change
• If an enhancement PR, please create docs and at best an example
• Add yourself to AUTHORS
• Updated the CHANGELOG