Fixes my mess-up THE SECOND

Created by: Kammerjunk

I'm not good at this 2: Electric Pullaloo: I Think It Works Without Conflicts Edition I changed it to check for both if the list exists and if the list has a length (because not checking for the latter makes it trigger even when the list is empty and I think not checking for both returns a runtime in the unlikely event there IS no exude_gasses var?). This'll fix plants going "ADMIN LOG: Admin (kammerjunk) has planted a packet exuding nothing. (JMP)" and keep them going "ADMIN LOG: Admin (kammerjunk) has planted a packet exuding plasma and oxygen. (JMP)"