Temporary fix for out-of-bounds field sampling
Temporary fix for out-of-bounds field sampling

Added a simple, and wholly incorrect, try-execute catch in `field.py`to
return zero values for attempts at out-of-bounds field.data sampling.

This is not anticipated as a final solution, but rather is a temporary
fix to allow some simulation work to continue on HPC clusters.

OceanPARCELS/parcels,OceanPARCELS/parcels