Added error for invalid enviroment variable values [MODULUS-59]
Added error for invalid enviroment variable values [MODULUS-59]

onmodulus/modulus-cli,nlindley/modulus-cli,XervoIO/cli,onmodulus/modulus-cli,XervoIO/cli,onmodulus/modulus-cli,nlindley/modulus-cli,XervoIO/cli