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When `CMAKE_FIND_PACKAGE_PREFER_CONFIG` mode was set to `ON`, failure to find a package was fatal even if it was not `REQUIRED`. Fix this and add a test case. Fixes: #19557
8ed86860
When `CMAKE_FIND_PACKAGE_PREFER_CONFIG` mode was set to `ON`, failure to find a package was fatal even if it was not `REQUIRED`. Fix this and add a test case. Fixes: #19557