Am 08.08.2017 um 10:23 schrieb Marc Hohl:

I wanted to write a little callback to remove all occurrencies
of "0" fingerings.

This doesn’t empty the stencil but removes the Fingering grobs completely (by suicide):

    \override Fingering.before-line-breaking =
    #(lambda (grob)
       (if (equal? (ly:grob-property grob 'text) "0")
           (ly:grob-suicide! grob)))

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