When we build Microsoft.DotNet.Wpf.GitHub.csproj GenerateNuspec task creates an arch-specific NuSpec, and
NuSpec declared in NuGetPackOutput does not exist.
Look for the arch-specific NuSpec
-->
<_NuspecFilePathCondition="'$(_NuspecFilePath)' == '' or !Exists('$(_NuspecFilePath)')">$(NuspecOutputPath)\$(PackageId).$(PackageVersion).nuspec</_NuspecFilePath>
</PropertyGroup>
<ErrorText="'$(_ScriptLocation)' is missing."Condition="!Exists('$(_ScriptLocation)')"/>
<ErrorText="'$(_NuspecFilePath)' is missing."Condition="!Exists('$(_NuspecFilePath)')"/>