fix for HGTD surfaces not being found (ATLSWUPGR-158)
A possible fix/workaround for ATLSWUPGR-158. Check if all pointers to surfaces are valid before adding to vector, and bail out early if returned vector is empty.
Edited by Nicholas Styles
A possible fix/workaround for ATLSWUPGR-158. Check if all pointers to surfaces are valid before adding to vector, and bail out early if returned vector is empty.