Return false if there are no sources #9208
Merged
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Fixes #9199
Context
The unhandled exception is from https://github.com/dotnet/msbuild/blob/3c910ba83fc9dbd8e12f50dddc8c381404f928c4/src/Tasks/GenerateResource.cs#L1132C13-L1133. But when source is not found and has errors, it should return false in Execute function.
Changes Made
Return false if there are no valid sources found.
Testing
Add a unit test case.
Notes