Fixed crashes when VCAI cannot find hero to recruit.

Bumped format version.

AI/VCAI/VCAI.cpp

@@ -1882,9 +1882,8 @@ void VCAI::tryRealize(CGoal g)
 		{
 			if(const CGTownInstance *t = findTownWithTavern())
 			{
-				//TODO co jesli nie ma dostepnego bohatera?
+				recruitHero(t, true);
 				//TODO jezeli miasto jest zablokowane, sprobowac oczyscic wejscie
-				cb->recruitHero(t, cb->getAvailableHeroes(t)[0]);
 			}
 
 			//TODO karkolomna alternatywa - tawerna na mapie przygod lub wiezienie (nie wiem, czy warto?)
@@ -2505,10 +2504,14 @@ void VCAI::checkHeroArmy (HeroPtr h)
 	}
 }
 
-void VCAI::recruitHero(const CGTownInstance * t)
+void VCAI::recruitHero(const CGTownInstance * t, bool throwing)
 {
 	BNLOG("Trying to recruit a hero in %s at %s", t->name % t->visitablePos())
-	cb->recruitHero(t, cb->getAvailableHeroes(t).front());
+
+	if(auto availableHero = frontOrNull(cb->getAvailableHeroes(t)))
+		cb->recruitHero(t, availableHero);
+	else if(throwing)
+		throw cannotFulfillGoalException("No available heroes in tavern in " + t->nodeName());
 }
 
 void VCAI::finish()

AI/VCAI/VCAI.h

@@ -359,7 +359,7 @@ public:
 	bool fulfillsGoal (CGoal &goal, CGoal &mainGoal);
 	bool fulfillsGoal (CGoal &goal, const CGoal &mainGoal); //TODO: something smarter
 
-	void recruitHero(const CGTownInstance * t);
+	void recruitHero(const CGTownInstance * t, bool throwing = false);
 	std::vector<const CGObjectInstance *> getPossibleDestinations(HeroPtr h);
 	void buildStructure(const CGTownInstance * t);
 	//void recruitCreatures(const CGTownInstance * t);

CCallback.cpp

@@ -251,6 +251,8 @@ void CCallback::setSelection(const CArmedInstance * obj)
 
 void CCallback::recruitHero(const CGObjectInstance *townOrTavern, const CGHeroInstance *hero)
 {
+	assert(townOrTavern);
+	assert(hero);
 	ui8 i=0;
 	for(; i<gs->players[player].availableHeroes.size(); i++)
 	{

lib/Connection.h

@@ -34,7 +34,7 @@
 #include "CObjectHandler.h" //for CArmedInstance
 #include "Mapping/CCampaignHandler.h" //for CCampaignState
 
-const ui32 version = 735;
+const ui32 version = 737;
 const TSlot COMMANDER_SLOT_PLACEHOLDER = -2;
 
 class CConnection;