Handle the case where the current working copy is not based on a checkout.

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Handle the case where the current working copy is not based on a checkout.
Print 'unknown' in verbose mode and nothing otherwise.

manifest hash: 5742c3c3a762b77ee1aeb62ed53b8f2d8e47a05d
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mercurial/commands.py

@@ -330,6 +330,10 b' def identify(ui, repo):'
     mflag = (c or a or d or u) and "+" or ""
     parents = [parent for parent in repo.dirstate.parents()
                       if parent != hg.nullid]
+    if not parents:
+        ui.note("unknown\n")
+        return
+
     tstring = ''
     if not ui.quiet:
         taglist = [e[1] for e in tags_load(repo)]