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Brad King authored
In commit 7a969fe2 (cmMakefile: Refactor API to better handle empty config values, 2020-06-30, v3.19.0-rc1~567^2), calls to `GetGeneratorConfigs` that pass `OnlyMultiConfig` only want to get any configurations listed if the generator is multi-config. Fix the implementation to actually do that. Fixes: #21316
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