ycb_django_pr11477

what a new run launched now would send

translate_url() creates an incorrect URL when optional named groups are missing in the URL pattern
Description
	
There is a problem when translating urls with absent 'optional' arguments
(it's seen in test case of the patch)

Work only inside this repository checkout. Make the code change the task
describes, keeping the diff focused — no drive-by refactors.

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