FindGTest: Create the gmock targets only when GTest has been found
When we introduced the GTest::gmock
and GTest::gmock_main
targets in !6632 (merged) 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.
Backport: release
Topic-rename: FindGTest-gmock-needs-gtest
Edited by Brad King