The check for required decoder hasn't a lot of sense

lib/msf/core/exploit/cmdstager.rb

@@ -138,15 +138,13 @@ module Exploit::CmdStager
   # @option opts :flavor [Symbol] The cmd stager to use.
   # @option opts :decoder [Symbol] The decoder stub to use.
   # @return [void]
-  # @raise [ArgumentError] raised if a cmd stager can not be selected, it isn't
-  #   compatible with the target platform or a required decoder stub can not be
-  #   selected.
+  # @raise [ArgumentError] raised if a cmd stager can not be selected or it
+  #   isn't compatible with the target platform.
   def select_cmdstager(opts = {})
     self.flavor = select_flavor(opts)
     raise ArgumentError, "Unable to select CMD Stager" if flavor.nil?
     raise ArgumentError, "The CMD Stager selected isn't compatible with the target" unless compatible?(flavor)
     self.decoder = select_decoder(opts)
-    raise ArgumentError, "Unable to select decoder stub" if decoder.nil? && decoder_required?(flavor)
   end
 
 
@@ -179,14 +177,6 @@ module Exploit::CmdStager
     DECODERS[f]
   end
 
-  # Answers if the input flavor needs a decoder stub.
-  #
-  # @param f [Symbol] the input flavor.
-  # @return [Boolean] true if the flavor needs a decoder, false otherwise.
-  def decoder_required?(f)
-    !DECODERS[f].nil?
-  end
-
   # Selects the correct cmd stager decoder to use based on three rules: (1) use
   # the decoder provided in input options, (2) use the decoder provided by the
   # user through datastore options, (3) select the default decoder for the