ProjectParserResult.OutputPath is null

`ProjectAliases.ParseProject` returns `ProjectParserResult` with `OutputPath` equals to `null` if project has `AnyCpu` configuration only and actual build configuration is not `AnyCpu`.

When I parse `AnyCpu` project with `x64`, I expect to get `OutputPath` for `AnyCpu` configuration.

Start with ProjectAliases.ParseProject and inspect how it populates ProjectParserResult.OutputPath when a project has only an AnyCpu configuration but the requested build configuration is x64. Reproduce that AnyCpu/x64 case and verify that parsing returns the AnyCpu output path instead of null.

Written by the indexing model from the issue text.