22eee12f556a9f749bf6645abd988212a524ad26
MixerStrip::show_send() may unset _panner if the send has no panner. When then triggering an action that emits `Pannable::automation_state_changed` (like un/link send panners) of the main panner, Ardour crashed. Note that PannerUI::set_panner already handed that case.
Please see the Ardour web site at https://ardour.org/ for all documentation..
For information on building ardour:
https://ardour.org/development.html
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