[PD-dev] [ pure-data-Patches-3606330 ] don't distribute empty lists to outlets

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Patches item #3606330, was opened at 2013-02-28 01:33
Message generated for change (Tracker Item Submitted) made by zmoelnig
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Category: puredata
Group: bugfix
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: IOhannes m zmölnig (zmoelnig)
Assigned to: Miller Puckette (millerpuckette)
Summary: don't distribute empty lists to outlets

Initial Comment:
sending an empty list to a patchable object that has neither bang-method nor an list- or anything-method, will silently ignore the message.
e.g.
[list(
|
[sin]

the problem comes from Pd's automatic unpacking of lists to the object's inlets, which in case of an empty list just does nothing.
the attached patch will only call the unpacking code if the list is non-empty (and fall back to the default anything method).

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=478072&aid=3606330&group_id=55736