Handle empty DCC_CodePage values without emitting a warning#448
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This PR fixes a bug in #397 where we mishandled
DCC_CodePagevalues.It's easy to forget, but we handle empty and null values equivalently when handling MSBuild properties, as that's how MSBuild itself works. It's impossible for
MSBuildState#getPropertyto return a null value.This was causing erroneous warnings to be emitted for projects that defined an empty
DCC_CodePageproperty, or didn't define one at all.