RehearsalMark erases StaffSymbol and returns warnings

[Thomas Morley]

This code:

\version "2.19.36"

{ c4 \mark \default }

returns several warnings of kind:
"warning: Found infinity or nan in output.  Substituting 0.0"
and the StaffSymbol is not printed.

Present at least since 2.19.29 up to 2.19.40.
Works fine with 2.18.2

As soon as something space-consuming is added all works again.
These examples are all fine:

{ c4 \mark \default \breathe }
{ c4 \mark \default \bar "" }
{ c4 \mark \default s2. }
{ c1 \mark \default }


Cheers,
  Harm