Use generic mmi error string for UT exceptions

import java.util.HashMap;

import java.util.Map;

import android.content.res.Resources;

import android.os.AsyncResult;

import android.os.Bundle;

import android.os.Message;

        // If ImsReasonInfo object does not have a String error code, use a

        // default error string.

        if (error.mExtraMessage == null) {

            errorString = new String("IMS UT exception");

            errorString = Resources.getSystem().getString(

                    com.android.internal.R.string.mmiError);

        }

        else {

            errorString = new String(error.mExtraMessage);