Land #9871, search without arguments shows help

Lol, you can still specify an empty string to search all modules.

lib/msf/ui/console/command_dispatcher/modules.rb

@@ -410,7 +410,7 @@ module Msf
           end
 
           def cmd_search_help
-            print_line "Usage: search [keywords]"
+            print_line "Usage: search <keywords>"
             print_line
             print_line "Keywords:"
             {
@@ -436,6 +436,12 @@ module Msf
           # Searches modules for specific keywords
           #
           def cmd_search(*args)
+            if args.empty?
+              print_error("Argument required\n")
+              cmd_search_help
+              return
+            end
+
             match   = ''
             search_term = nil
             @@search_opts.parse(args) { |opt, idx, val|