fix another uninitialized class var warning

git-svn-id: file:///home/svn/framework3/trunk@7494 4d416f70-5f16-0410-b530-b9f4589650da

lib/rex/poly.rb

@@ -19,6 +19,7 @@ class State
 	# Initializes the polymorphic generation state.
 	#
 	def initialize
+		@block_list = nil
 		reset
 	end
 
@@ -128,4 +129,4 @@ class State
 end
 
 end
-end
+end