Simulation command fails if BKG not defined #79
Description
I commented out the BKG= line in my mcwrapper config file since I put all of the settings for background in a CUSTOM_GCONTROL file. When I ran mcwrapper interactively, it crashed with a message:
file:/work/halld/CPP/MC/generated/gen_2pi_primakoff/2022.01.16.davidl/gen_2pi_primakoff_071728_000.hddm: Command not found.
The above is defined in my config file for GENERATOR. When I defined BKG in config it ran just fine. It looks like if BKG is not defined mcwrapper gets confused about what is the executable and what is the argument.