Support empty steps in newJO menu CF/DF building - enable more muon steps

Tomasz Boldrequested to merge
tbold/athena:enable-all-muon-steps into master

This MR contains two changes

  1. more muon steps are enabled (rather minor)
  2. support of empty steps in newJO is added. The new empty steps are added in a different way as in mainline.

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