fix bug in import when seating or standing capacity empty
fix bug in import when seating or standing capacity empty

Association-Merci-Edgar/Merci-Edgar,Association-Merci-Edgar/Merci-Edgar,Association-Merci-Edgar/Merci-Edgar,rsareth/edgar,WildCodeSchool/Merci-Edgar,WildCodeSchool/Merci-Edgar,Association-Merci-Edgar/Merci-Edgar,rsareth/edgar,WildCodeSchool/Merci-Edgar,rsareth/edgar,WildCodeSchool/Merci-Edgar,rsareth/edgar