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bpo-41403: Improve error message for invalid mock target (GH-30833) (GH-30834)

(cherry picked from commit f7955a82e36d4c32ebdd7b7707cdf0e6ffa7a418)
I
Irit Katriel committed
e3ade66ec575e0cb4882cfdff155ef962e67c837
Parent: a7a4ca4
Committed by GitHub <noreply@github.com> on 1/23/2022, 7:34:43 PM