fix error where commands was nil

git-svn-id: file:///home/svn/framework3/trunk@11335 4d416f70-5f16-0410-b530-b9f4589650da

scripts/meterpreter/multicommand.rb

@@ -63,6 +63,7 @@ def usage
 	raise Rex::Script::Completed
 
 end
+
 ################## Main ##################
 @@exec_opts.parse(args) { |opt, idx, val|
 	case opt
@@ -74,6 +75,7 @@ end
 		if not ::File.exists?(script)
 			raise "Command List File does not exists!"
 		else
+			commands ||= ''
 			::File.open(script, "r").each_line do |line|
 				commands << line.chomp
 			end
@@ -83,7 +85,6 @@ end
 	when "-h"
 		help = 1
 	end
-
 }
 
 if args.length == 0 or help == 1