Do not reload VM and everything if no forwarded ports were destroyed

lib/vagrant/actions/vm/forward_ports.rb

@@ -67,10 +67,12 @@ module Vagrant
         end
 
         def clear
-          logger.info "Deleting any previously set forwarded ports..."
-          fp = @runner.vm.forwarded_ports.dup
-          fp.collect { |p| p.destroy }
-          @runner.reload!
+          if runner.vm.forwarded_ports.length > 0
+            logger.info "Deleting any previously set forwarded ports..."
+            fp = runner.vm.forwarded_ports.dup
+            fp.collect { |p| p.destroy }
+            runner.reload!
+          end
         end
 
         def forward_ports

test/vagrant/actions/vm/forward_ports_test.rb

@@ -164,9 +164,15 @@ class ForwardPortsActionTest < Test::Unit::TestCase
         forwarded_ports << port
       end
 
-      @vm.expects(:forwarded_ports).returns(forwarded_ports)
+      @vm.stubs(:forwarded_ports).returns(forwarded_ports)
       @runner.expects(:reload!)
       @action.clear
     end
+
+    should "do nothing if there are no forwarded ports" do
+      @vm.stubs(:forwarded_ports).returns([])
+      @runner.expects(:reload!).never
+      @action.clear
+    end
   end
 end