hgext/bookmarks.py

--- a/hgext/bookmarks.py	Thu Aug 19 22:51:09 2010 +0200
+++ b/hgext/bookmarks.py	Thu Aug 19 15:04:21 2010 -0400
@@ -442,9 +442,12 @@
             if b in repo._bookmarks:
                 ui.status(_("exporting bookmark %s\n") % b)
                 new = repo[b].hex()
-            else:
+            elif b in rb:
                 ui.status(_("deleting remote bookmark %s\n") % b)
                 new = '' # delete
+            else:
+                ui.warn(_('bookmark %s does not exist on the local or remote repository!\n') % b)
+                return 2
             old = rb.get(b, '')
             r = other.pushkey('bookmarks', b, old, new)
             if not r: