Removes default empty state to be set

* This used to break moving new machine without state

CorsixTH/Lua/dialogs/place_objects.lua

@@ -510,7 +510,7 @@ function UIPlaceObjects:placeObject(dont_close_if_empty)
     self.world:prepareFootprintTilesForBuild(object_footprint, self.object_cell_x, self.object_cell_y)
     real_obj = self.world:newObject(object.object.id,
         self.object_cell_x, self.object_cell_y, self.object_orientation)
-    real_obj:setState(object.state or {})
+    real_obj:setState(object.state)
   end
   if room then
     room.objects[real_obj] = true

CorsixTH/Luatest/spec/entities/machine_spec.lua

@@ -61,4 +61,16 @@ describe("object.lua: ", function()
     assert.are.equal(machine1.times_used, machine2.times_used)
     assert.are.equal(machine1.total_usage, machine2.total_usage)
   end)
+  it("setting null state doesn't clear values", function()
+    local machine = createMachineWithFakeInput()
+    machine:updateDynamicInfo()
+
+    assert.are.equal(1, machine.times_used)
+    assert.are.equal(1, machine.total_usage)
+
+    machine:setState(nil)
+
+    assert.are.equal(1, machine.times_used)
+    assert.are.equal(1, machine.total_usage)
+  end)
 end)