zplane does not return vectors of handles

[patched]

Hi,

I have found a discrepancy between the matlab specification and
the octave implementation of the zplane function, found in the signal
package.

The octave implementation does not give any output values, but matlab does:
/[hz,hp,ht] = zplane(___) returns vectors of handles to the zero lines, hz,
and the pole lines, hp. 
ht is a vector of handles to the axes/unit circle line and to text objects,
 which are present when there are multiple zeros or poles./
( https://se.mathworks.com/help/signal/ref/zplane.html#d120e189724
<https://se.mathworks.com/help/signal/ref/zplane.html#d120e189724>  )

Cheers!



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