status: make unresolved files always be in the morestatus structured output
We don't know the status of those files, only that they're unresolved, so
we don't output the status for those - any code parsing this will have to be
tolerant to that.
Differential Revision: https://phab.mercurial-scm.org/D7668
local test passed
addgroupcopy test passed
clone test passed
lowlevelcopy test passed
slicing test passed
issnapshot test passed
findsnapshot test passed