Sven van Haastregt
a9b3f0f4fe
Check for gnuplot before collecting data.
This should address issue:
Check for gnuplot before running - ID: 3062202
http://sourceforge.net/tracker/?func=detail&aid=3062202&group_id=203965&atid=987711
Signed-off-by: Sven van Haastregt <svhaastr@liacs.nl>