ycb_django_pr15103

what a new run launched now would send

Make the element_id argument of json_script optional
Description
	
I recently had a use-case where I wanted to use json_script but I didn't need any id for it (I was including the <script> inside a <template> so I didn't need an id to refer to it).
I can't see any reason (security or otherwise) for the id to be required and making it optional doesn't seem to break any tests.

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