Correctly converting nullables for MapAtRuntime; fixes #4597#4604

jbogard merged 1 commit intomainLuckyPennySoftware/AutoMapper:mainfrom

4597-mapatruntime-with-with-non-nullable-to-nullable-mapping-fails-when-extension-methods-are-usedLuckyPennySoftware/AutoMapper:4597-mapatruntime-with-with-non-nullable-to-nullable-mapping-fails-when-extension-methods-are-usedCopy head branch name to clipboard