Bug 71538 - Pages might not be returned at first req.submit()

Query.Generator returns if self.resultkey is not found in the first
batch of retrieved data.

If "query-continue" is present, valid data might be returned later, so
the query must continue.

Change-Id: I5aa1979d5c7f5c7da74686d91162ecad669a83cf
Merge "Bug 71538 - Pages might not be returned at first req.submit()"