[Bug 729333] orc: Add some checks on the number of variables per type

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=729333
  GStreamer | orc | git

--- Comment #5 from Vincent Penquerc'h <vincent.penquerch at collabora.co.uk> 2014-05-01 16:06:43 UTC ---
It could return NULL. It did seem odd, but I guess it was done for easy printf
use.

Ensuring no multiple errors seems very hard given some of the code. A lot of it
logs an error but does not return (just sets an error and goes on). 

Accumulating... could make sense in theory, but I'm not sure it's worth it in
practice ?

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