VS Generator: Properly reference included external C# projects

Source/cmVisualStudio10TargetGenerator.cxx

@@ -4253,11 +4253,10 @@ void cmVisualStudio10TargetGenerator::WriteProjectReferences(Elem& e0)
     if (dt->IsCSharpOnly() || cmHasLiteralSuffix(path, "csproj")) {
       e2.Element("SkipGetTargetFrameworkProperties", "true");
     }
-
     // Don't reference targets that don't produce any output.
-    if (this->Configurations.empty() ||
-        dt->GetManagedType(this->Configurations[0]) ==
-          cmGeneratorTarget::ManagedType::Undefined) {
+    else if (this->Configurations.empty() ||
+             dt->GetManagedType(this->Configurations[0]) ==
+               cmGeneratorTarget::ManagedType::Undefined) {
       e2.Element("ReferenceOutputAssembly", "false");
       e2.Element("CopyToOutputDirectory", "Never");
     }