Add csproj changes related to pull #54 (#58)

* Add csproj changes related to pull #54

* Add null check

src/SourcemapToolkit.SourcemapParser/SourceMapTransformer.cs

@@ -17,8 +17,8 @@ namespace SourcemapToolkit.SourcemapParser
                 File = sourceMap.File,
                 Version = sourceMap.Version,
                 Mappings = sourceMap.Mappings,
-                Sources = new List<string>(sourceMap.Sources),
-                Names = new List<string>(sourceMap.Names),
+                Sources = sourceMap.Sources == null ? null : new List<string>(sourceMap.Sources),
+                Names = sourceMap.Names == null ? null : new List<string>(sourceMap.Names),
                 ParsedMappings = new List<MappingEntry>()
             };
 

src/SourcemapToolkit.SourcemapParser/SourcemapToolkit.SourcemapParser.csproj

@@ -61,6 +61,7 @@
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="SourceMapGenerator.cs" />
     <Compile Include="SourceMapParser.cs" />
+    <Compile Include="SourceMapTransformer.cs" />
     <Compile Include="SourcePosition.cs" />
   </ItemGroup>
   <ItemGroup>

tests/SourcemapToolkit.SourcemapParser.UnitTests/SourcemapToolkit.SourcemapParser.UnitTests.csproj

@@ -70,6 +70,7 @@
     <Compile Include="MappingsListParserUnitTests.cs" />
     <Compile Include="SourceMapGeneratorUnitTests.cs" />
     <Compile Include="SourceMapParserUnitTests.cs" />
+    <Compile Include="SourceMapTransformerUnitTests.cs" />
     <Compile Include="SourceMapUnitTests.cs" />
     <Compile Include="SourcePositionUnitTests.cs" />
     <Compile Include="UnitTestUtils.cs" />