Interpret empty language as "default" in the internat sample

This provides a more convenient way of testing wxLANGUAGE_DEFAULT than
selecting it from the dialog shown on startup.

This commit is best viewed ignoring whitespace-only changes.

samples/internat/internat.cpp

@@ -215,6 +215,12 @@ bool MyApp::OnCmdLineParsed(wxCmdLineParser& parser)
     if ( parser.GetParamCount() )
     {
         const wxString loc = parser.GetParam();
+        if ( loc.empty() )
+        {
+            m_lang = wxLANGUAGE_DEFAULT;
+        }
+        else
+        {
             const wxLanguageInfo * const lang = wxLocale::FindLanguageInfo(loc);
             if ( !lang )
             {
@@ -224,6 +230,7 @@ bool MyApp::OnCmdLineParsed(wxCmdLineParser& parser)
 
             m_lang = static_cast<wxLanguage>(lang->Language);
         }
+    }
 
     return true;
 }