_count=0 shall be treated the same as _summary=count

[kennethmyhra]

if _count has the value 0, this shall be treated the same as _summary=count: the server returns a bundle that reports the total number of resources that match in Bundle.total, but with no entries, and no prev/next/last links. Note that the Bundle.total only include the total number of matching resources. It does not count extra resources such as OperationOutcome or included resources that may also be returned.

http://hl7.org/fhir/search.html#count

Applies to specification version(s): STU3 and R4