Merge pull request #5951 from Opuszek/fix_crashing_hero_spell_widget

Fixes crash on uncheck customize spell

lib/mapObjects/CGHeroInstance.cpp

@@ -1273,6 +1273,11 @@ void CGHeroInstance::removeSpellbook()
 	}
 }
 
+void CGHeroInstance::removeAllSpells()
+{
+	spells.clear();
+}
+
 const std::set<SpellID> & CGHeroInstance::getSpellsInSpellbook() const
 {
 	return spells;

lib/mapObjects/CGHeroInstance.h

@@ -157,6 +157,7 @@ public:
 	bool spellbookContainsSpell(const SpellID & spell) const;
 	std::vector<BonusSourceID> getSourcesForSpell(const SpellID & spell) const;
 	void removeSpellbook();
+	void removeAllSpells();
 	const std::set<SpellID> & getSpellsInSpellbook() const;
 	EAlignment getAlignment() const;
 	bool needsLastStack()const override;