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When we introduced the `GTest::gmock` and `GTest::gmock_main` targets in commit 50bf457a (FindGTest: Add target for gmock library, 2021-10-17, v3.23.0-rc1~321^2) we failed to handle the case where GTest isn't found. Don't construct gmock targets that depend on non-existent gtest targets when gtest failed to be found.
1aa95e1a