calc: gracefully handle `ExpressionEvaluator.Error` #1235

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Run time

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Job	Run time
Test suite (3.8)	1m 41s
Test suite (3.9)	1m 41s
Test suite (3.10)	1m 41s
Test suite (3.11)	1m 43s
Finalize job on coveralls.io	13s
	6m 59s