Providing -pp will suppress errors and fail silently

[nagilson]

To reproduce, do the following:

1. Create a new console project with dotnet new console.
2. Open the foo.csproj or project file created by new console. Edit it to be like this:

<Project Sdk="Microsoft.NET.Sdk">
  <Message>Blah</Message>
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net7.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>
</Project>

run dotnet msbuild --pp and observe that no error is produced and msbuild is silent, but without --pp it will raise an error.