HandleEntitiesPacketCrashFix

<div> <pre>Fixes a client crash caused by the server sending an entity packet for an entity type the client cannot resolve<br /><br />Usually happens when first connecting to a server, sometimes multiple times. I don't have a clue why it happens but the fix is to filter out null entities and log an error instead.<br /><br />The crash log looks something like this:<br /><br />System.InvalidOperationException: Server sent me an entity packet for entity player, but I cannot instantiate/update it, entity is null at Vintagestory.Client.NoObf.ClientSystemEntities.HandleEntitiesPacket(Packet_Server serverpacket) in VintagestoryLib\Client\Systems\Entities.cs:line 248 at Vintagestory.Client.NoObf.ProcessPacketTask.ProcessPacket(Packet_Server packet) in VintagestoryLib\Client\Systems\ProcessPacketTask.cs:line 18 at Vintagestory.Client.NoObf.ProcessPacketTask.Run() in VintagestoryLib\Client\Systems\ProcessPacketTask.cs:line 12 at Vintagestory.Client.NoObf.ClientMain.ExecuteMainThreadTasks(Single deltaTime) in VintagestoryLib\Client\ClientMain.cs:line 786 at Vintagestory.Client.GuiScreenConnectingToServer.RenderToDefaultFramebuffer(Single dt) in VintagestoryLib\Client\MainMenu\Screens\GuiScreenConnectingToServer.cs:line 298 at Vintagestory.Client.ScreenManager.Render(Single dt) in VintagestoryLib\Client\ScreenManager.cs:line 760 at Vintagestory.Client.ScreenManager.OnNewFrame(Single dt) in VintagestoryLib\Client\ScreenManager.cs:line 663 at Vintagestory.Client.NoObf.ClientPlatformWindows.window_RenderFrame(FrameEventArgs e) in VintagestoryLib\Client\ClientPlatform\GameWindow.cs:line 112 at OpenTK.Windowing.Desktop.GameWindow.Run() at Vintagestory.Client.ClientProgram.Start(ClientProgramArgs args, String[] rawArgs) in VintagestoryLib\Client\ClientProgram.cs:line 338 at Vintagestory.Client.ClientProgram.&lt;&gt;c<u>DisplayClass10_0.&lt;.ctor&gt;b</u>1() in VintagestoryLib\Client\ClientProgram.cs:line 133 at Vintagestory.ClientNative.CrashReporter.Start(ThreadStart start) in VintagestoryLib\Client\ClientPlatform\ClientNative\CrashReporter.cs:line 95</pre> </div>