Rescue errors and update credits

Author: HD Moore

modules/exploits/multi/http/rails_xml_yaml_code_exec.rb

@@ -21,12 +21,16 @@ def initialize(info = {})
 				processor of the Ruby on Rails application framework. This vulnerability allows
 				an attacker to instantiate a remote object, which in turn can be used to execute
 				any ruby code remotely in the context of the application.
+
+				This module has been tested across multiple versions of RoR 3.x, but does not yet
+				work against 2.x versions of RoR.
+
 			},
 			'Author'         =>
 				[
 					'charlisome',  # PoC
 					'espes',       # PoC and Metasploit module
-					'toothfairy',  # Anonymous contributor
+					'lian',        # Identified the RouteSet::NamedRouteCollection vector
 					'hdm'          # Module merge/conversion/payload work
 				],
 			'License'        => MSF_LICENSE,
@@ -72,7 +76,7 @@ def detached_payload_stub(code)
 			end
 		else
 			if ! Process.fork()
-				eval(code)
+				eval(code) rescue nil
 			end
 		end
 	^.strip.split(/\n/).map{|line| line.strip}.join("\n")