fix initializing with unknown options

Author: indirect

lib/thor.rb

@@ -314,7 +314,7 @@ def stop_on_unknown_option!(*command_names)
     end
 
     def stop_on_unknown_option?(command) #:nodoc:
-      !!@stop_on_unknown_option && @stop_on_unknown_option.include?(command.name.to_sym)
+      command && !@stop_on_unknown_option.nil? && @stop_on_unknown_option.include?(command.name.to_sym)
     end
 
   protected

spec/thor_spec.rb

@@ -153,6 +153,10 @@ def boring(*args)
         expect(klass.stop_on_unknown_option?(mock :name => "baz")).to be_false
       end
     end
+
+    it "doesn't break new" do
+      expect(my_script.new).to be_a(Thor)
+    end
   end
 
   describe "#map" do