Fix two calls to Exception.message, which no longer exists

[mliu49]

Motivation or Problem

Exceptions no longer have a message attribute. We fixed a bunch of cases already, but missed some.

Description of Changes

Replace calls to Exception.message with str(Exception).

Testing

These changes fixed the issues I was having. I don't know if it's necessary to do additional testing.

[codecov]

Codecov Report

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@@            Coverage Diff            @@
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  Branches          ?     6869           
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  Hits              ?     8514           
  Misses            ?    16619           
  Partials          ?      970

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[ajocher]

Thanks for fixing. This looks fine to me and ready to be merged.

[mliu49]

Thanks!