passed rLocale remains unchanged if no mapping found

Change-Id: I4d1494dc5cba7a92fb067191477c3cbba46b056d

i18nlangtag/source/isolang/isolang.cxx

@@ -710,10 +710,7 @@ void MsLangId::Conversion::convertLanguageToLocaleImpl( LanguageType nLang,
     }
     while ( pPrivateEntry->mnLang != LANGUAGE_DONTKNOW );
 
-    // Not found. The effective result is the empty SYSTEM locale.
-    rLocale.Language = OUString();
-    rLocale.Country  = OUString();
-    rLocale.Variant  = OUString();
+    // Not found. Passed rLocale argument remains unchanged.
 }
 
 // -----------------------------------------------------------------------

include/i18nlangtag/mslangid.hxx

@@ -242,7 +242,12 @@ public:
         I18NLANGTAG_DLLPRIVATE static ::com::sun::star::lang::Locale convertLanguageToLocale(
                 LanguageType nLang, bool bResolveSystem );
 
-        /** Used by convertLanguageToLocale(LanguageType,bool) */
+        /** Used by convertLanguageToLocale(LanguageType,bool)
+
+            @return rLocale set to mapped values, unchanged if no mapping was
+                    found. E.g. pass empty Locale to obtain empty SYSTEM locale
+                    for that case.
+         */
         I18NLANGTAG_DLLPRIVATE static void convertLanguageToLocaleImpl(
                 LanguageType nLang, ::com::sun::star::lang::Locale & rLocale );