urlapi: add CURLU_GET_EMPTY for empty queries and fragments #13396
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By default the API inhibits empty queries and fragments extracted. Unless this new flag is set.
This also makes the behavior more consistent: without it set, zero length queries and fragments are considered not present in the URL. With the flag set, they are returned as a zero length strings if they were in fact present in the URL.
This applies when extracting the individual query and fragment components and for the full URL.