[no squash] Minor bugfixes

src/client/game.cpp

@@ -972,7 +972,7 @@ class Game {
 
 	bool m_first_loop_after_window_activation = false;
 	bool m_camera_offset_changed = false;
-	bool m_game_focused;
+	bool m_game_focused = false;
 
 	bool m_does_lost_focus_pause_game = false;
 
@@ -1951,7 +1951,7 @@ void Game::processUserInput(f32 dtime)
 {
 	// Reset input if window not active or some menu is active
 	if (!device->isWindowActive() || isMenuActive() || guienv->hasFocus(gui_chat_console)) {
-		if(m_game_focused) {
+		if (m_game_focused) {
 			m_game_focused = false;
 			infostream << "Game lost focus" << std::endl;
 			input->releaseAllKeys();

src/client/mesh.cpp

@@ -337,6 +337,8 @@ bool checkMeshNormals(scene::IMesh *mesh)
 
 	for (u32 i = 0; i < buffer_count; i++) {
 		scene::IMeshBuffer *buffer = mesh->getMeshBuffer(i);
+		if (!buffer->getVertexCount())
+			continue;
 
 		// Here we intentionally check only first normal, assuming that if buffer
 		// has it valid, then most likely all other ones are fine too. We can

src/network/networkpacket.cpp

@@ -63,7 +63,8 @@ void NetworkPacket::putRawPacket(const u8 *data, u32 datasize, session_t peer_id
 
 	// split command and datas
 	m_command = readU16(&data[0]);
-	memcpy(m_data.data(), &data[2], m_datasize);
+	if (m_datasize > 0)
+		memcpy(m_data.data(), &data[2], m_datasize);
 }
 
 void NetworkPacket::clear()
@@ -553,7 +554,8 @@ Buffer<u8> NetworkPacket::oldForgePacket()
 {
 	Buffer<u8> sb(m_datasize + 2);
 	writeU16(&sb[0], m_command);
-	memcpy(&sb[2], m_data.data(), m_datasize);
+	if (m_datasize > 0)
+		memcpy(&sb[2], m_data.data(), m_datasize);
 
 	return sb;
 }