use a better check for whether rhosts exists

lib/msf/core/exploit.rb

@@ -294,7 +294,7 @@ class Exploit < Msf::Module
         # Don't add the automatic target unless there's already more than one target to pick from
         if info['Targets'].count > 1
           # Finally, only add the target if there is a remote host option
-          if self.respond_to?(:rhost)
+          if self.options['RHOST']
             auto = ["Automatic", { 'AutoGenerated' => true}]
             info['Targets'].unshift(auto)
           end
@@ -302,7 +302,6 @@ class Exploit < Msf::Module
       end
     end
 
-
     self.targets = Rex::Transformer.transform(info['Targets'], Array,
         [ Target ], 'Targets')
     self.default_target = info['DefaultTarget'] || 0
@@ -702,7 +701,6 @@ class Exploit < Msf::Module
           datastore['TARGET'] = 1
         end
       end
-
     end
 
     target_idx = target_index