Fixing bug 2418114. Added a check to make sure the TTS sample string for

a language-country combination is available before trying to use it.

src/com/android/settings/TextToSpeechSettings.java

@@ -425,8 +425,10 @@ public class TextToSpeechSettings extends PreferenceActivity implements
         // update the demo string
         mDemoStringIndex = mDefaultLocPref.findIndexOfValue(mDefaultLanguage + LOCALE_DELIMITER
                 + mDefaultCountry);
+        if (mDemoStringIndex > -1){
             mDefaultLocPref.setValueIndex(mDemoStringIndex);
         }
+    }
 
     /**
      * (helper function for initDefaultLang() )