verify_working_env() is called too early for invalid commands

[TinCanTech]

EG:

$ easyrsa --pki-dir=ns --nopass bild-cat

WARNING
=======
No Easy-RSA 'vars' configuration file exists!

IMPORTANT:
  The preferred location for 'vars' is within the PKI folder.
  To silence this message move your 'vars' file to your PKI
  or declare your 'vars' file with option: --vars=<FILE>

WARNING
=======
install_data_to_pki - Missing: 'x509-types'

EasyRSA version ~VER~

Error
-----
Missing expected CA file: ca.crt

(perhaps you need to run build-ca?)

Run easyrsa without commands for usage and command help.

Simple but irritating fix, EG:

case "$cmd" in
	init-pki|clean-all)
		init_pki "$@"
		;;
	build-ca)
		# Do verify_working_env() AFTER the command is recognised
		verify_working_env

		[ -z "$alias_days" ] || \
			export EASYRSA_CA_EXPIRE="$alias_days"
		build_ca "$@"
		;;