Bounds-check every gridResultValues access in interpolateGridResultValue
to prevent segfaults observed in interpolateInterfaceValues' OMP loop
when a result vector was empty or sized for a different result position
type. OOB now returns the infinity sentinel that matches the existing
undefined-value path and the initializeResultValues pre-fill, so
downstream invalid-value checks correctly skip these slots.
interpolateInterfaceValues additionally short-circuits and logs a
warning with the field/component name when the input result vector is
empty, instead of failing silently.
Magne Sjaastad
86500efbdc