Fix a crash in the gain selection part of the code in case there is a…#63

vmarandon wants to merge 1 commit intocta-observatory:maincta-observatory/ctapipe_io_nectarcam:mainfrom

vmarandon:FixGainSelectionCrashWithIncompleteEventsvmarandon/ctapipe_io_nectarcam:FixGainSelectionCrashWithIncompleteEventsCopy head branch name to clipboard