_WRAP_SIGNAL: when the C klass does not have a virtual function

[Debarshi Ray <debarshi ray gmail com>]

When I am using _WRAP_SIGNAL to wrap a signal (eg.,
animation_completed of ChamplainView) it assumes that a virtual method
(eg., klass->animation_completed) is present to allow default signal
handlers. However ChamplainView does not have such a virtual method.
Do I need to fix ChamplainView?

Happy hacking,
Debarshi
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