Seg Fault for bad Field ID

plotxy(vis=DB, xaxis='time', yaxis='amp', datacolumn='data', fieldid=15)

fieldid=15 did not exist.  I got a segmentation fault and core dump.  Of
course, this could happen more naturally because of the fieldid offset
mentioned in previous email.

plotxy needs a trap on this error.  This problem may apply to other tasks.

• Joe says: Fixed in Patch level 3