Do not crash on attempt to load campaign with unsupported maps

Mods/vcmi/config/vcmi/english.json

@@ -72,6 +72,7 @@
 	"vcmi.lobby.noUnderground" : "no underground",
 	"vcmi.lobby.sortDate" : "Sorts maps by change date",
 
+	"vcmi.client.errors.invalidMap" : "{Invalid map or campaign}\n\nFailed to start game! Selected map or campaign might be invalid or corrupted. Reason:\n%s",
 	"vcmi.client.errors.missingCampaigns" : "{Missing data files}\n\nCampaigns data files were not found! You may be using incomplete or corrupted Heroes 3 data files. Please reinstall game data.",
 	"vcmi.server.errors.existingProcess" : "Another VCMI server process is running. Please terminate it before starting a new game.",
 	"vcmi.server.errors.modsToEnable"    : "{Following mods are required}",

client/lobby/CLobbyScreen.cpp

@@ -127,11 +127,23 @@ void CLobbyScreen::toggleTab(std::shared_ptr<CIntObject> tab)
 
 void CLobbyScreen::startCampaign()
 {
-	if(CSH->mi)
-	{
+	if(!CSH->mi)
+		return;
+
+	try {
 		auto ourCampaign = CampaignHandler::getCampaign(CSH->mi->fileURI);
 		CSH->setCampaignState(ourCampaign);
 	}
+	catch (const std::runtime_error &e)
+	{
+		// handle possible exception on map loading. For example campaign that contains map in unsupported format
+		// for example, wog campaigns or hota campaigns without hota map support mod
+		MetaString message;
+		message.appendTextID("vcmi.client.errors.invalidMap");
+		message.replaceRawString(e.what());
+
+		CInfoWindow::showInfoDialog(message.toString(), {});
+	}
 }
 
 void CLobbyScreen::startScenario(bool allowOnlyAI)