Fix Utils::LanguageVersion::None handling

Change-Id: Id0d8bd59c1a317103ea309ee2f9b982ecfd6d6c7
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>

src/plugins/cppcheck/cppchecktool.cpp

@@ -165,6 +165,8 @@ QStringList CppcheckTool::additionalArguments(const CppTools::ProjectPart &part)
     case Version::CXX2a:
         result.push_back("--language=c++");
         break;
+    case Version::None:
+        break;
     }
 
     using QtVersion = CppTools::ProjectPart::QtVersion;

src/plugins/cpptools/cppcodemodelinspectordumper.cpp

@@ -107,6 +107,7 @@ QString Utils::toString(::Utils::LanguageVersion languageVersion)
 {
 #define CASE_LANGUAGEVERSION(x) case ::Utils::LanguageVersion::x: return QLatin1String(#x)
     switch (languageVersion) {
+        CASE_LANGUAGEVERSION(None);
         CASE_LANGUAGEVERSION(C89);
         CASE_LANGUAGEVERSION(C99);
         CASE_LANGUAGEVERSION(C11);