LPS-41489 Requires null and empty check.

jsonFactoryUtil.looseDeserialize will fail if parentFieldRawValue is an empty string.
LPS-41531 Do not show a link to a locale that the site doesn't allow
LPS-41531 Remove unncessary code? portlet:defineObjects doesn't make "themeDisplay", that's in liferay-theme:defineObjects which is in common/init.jsp and is already included.
LPS-41560