DesignReferenceProvider provides reference for the design resource which doesn't have content resource

[pankaj-parashar]

As per api doc https://developer.adobe.com/experience-manager/reference-materials/6-5/javadoc/com/day/cq/wcm/api/designer/Design.html#getContentResource-- , the api can return null if the design doesn't have the content resource. In this case, DesignReferenceProvider still returning reference which will return null for the api https://developer.adobe.com/experience-manager/reference-materials/6-5/javadoc/com/day/cq/wcm/api/reference/Reference.html#getResource-- this can cause NPE in the code consuming the references provided by DesignReferenceProvider. It shouldn't references for the valid resource only.

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• ACS AEM Commons Version: _____
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