archive: fix bogus error message with no working directory

mercurial/commands.py

@@ -156,7 +156,7 b' def archive(ui, repo, dest, **opts):'
 
     ctx = repo[opts.get('rev')]
     if not ctx:
-        raise util.Abort(_('repository has no revisions'))
+        raise util.Abort(_('no working directory: please specify a revision'))
     node = ctx.node()
     dest = cmdutil.make_filename(repo, dest, node)
     if os.path.realpath(dest) == repo.root:

tests/test-archive.out

@@ -60,4 +60,4 b' rev-0.tar created'
 abort: unknown archive type 'bogus'
 % server errors
 % empty repo
-abort: repository has no revisions
+abort: no working directory: please specify a revision