test if an MSBuild property is defined?

Question

There exists common method for overriding properties.

Sample from C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets

   <PropertyGroup>
       <TargetFrameworkIdentifier Condition="'$(TargetFrameworkIdentifier)' == ''">.NETFramework</TargetFrameworkIdentifier>
       <TargetFrameworkVersion Condition=" '$(TargetFrameworkVersion)' == '' ">v4.0</TargetFrameworkVersion>
   </PropertyGroup>

If you will try to get value from $(NeverDefinedProperty) you just get an empty string.
Can you describe the problem you want to solve?

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