Merge "Changed assist summary from "None" -> Empty"

    <com.android.settings.widget.GearPreference

        android:key="default_assist"

        android:title="@string/default_assist_title"

        android:summary="@string/app_list_preference_none"

        android:summary="@string/summary_placeholder"

        android:fragment="com.android.settings.applications.assist.DefaultAssistPicker"/>

    <Preference