cmdutil: allow callers of cmdutil.dorecord to omit suggestion

Interactive committing under non-interactive mode shows command
suggestion, but sometimes it is meaningless.

  command      suggestion usability
  ------------ ---------- -----------
  record       commit
  commit -i    commit     meaningless
  qrecord      qnew
  qnew -i      qnew       meaningless
  qrefersh -i  qrefresh   meaningless
  shelve -i    commit     incorrect
  ------------ ---------- -----------

This patch allows callers of 'cmdutil.dorecord()' to omit meaningless
suggestion by passing None or so for 'cmdsuggest' argument of it.

This is a preparation for subsequent patches, which fix each
suggestion issues above.

mercurial/cmdutil.py

@@ -81,8 +81,11 b' def dorecord(ui, repo, commitfunc, cmdsu'
     import merge as mergemod
 
     if not ui.interactive():
-        raise util.Abort(_('running non-interactively, use %s instead') %
-                         cmdsuggest)
+        if cmdsuggest:
+            msg = _('running non-interactively, use %s instead') % cmdsuggest
+        else:
+            msg = _('running non-interactively')
+        raise util.Abort(msg)
 
     # make sure username is set before going interactive
     if not opts.get('user'):