exe/dockerun in dockerun-0.4.0 vs exe/dockerun in dockerun-0.4.1

@@ -1,14 +1,21 @@
 #!/usr/bin/env ruby
 
 require_relative '../lib/dockerun'
 
+require 'colorize'
+
 # Operations
 # 1. [i]nit - Copy sample spec into project dir
 # 2. [r]un - Run the spec (default without params)
 # 3. [d]elete [c]ontainer - Delete container (using image name inside spec)
 # 4. [d]elete [i]mage - Delete image (Using container name inside spec)
 # 5. reset - Delete container and image
 
 cli = Dockerun::CliEngine.new
-cli.parse_argv(ARGV)
+begin
+  cli.parse_argv(ARGV)
+rescue TR::ArgUtils::RequiredFieldEmpty => ex
+  STDERR.puts "\n Operation requires parameter. Error was : #{ex.message}".red
+  puts cli.parse_argv(["help"])
+end