Merge pull request #6816 from mattsc/fix_segfault_attack

Fix seg fault when weapon is removed during attack

src/actions/attack.cpp

@@ -1221,6 +1221,16 @@ bool attack::perform_hit(bool attacker_turn, statistics::attack_context& stats)
 	}
 
 	--attacker.n_attacks_;
+
+	// If an event removed a unit's weapon, set number of remaining attacks to zero
+	// for that unit, but let the other unit continue
+	if (attacker_stats->weapon == nullptr){
+        attacker.n_attacks_ = 0;
+	}
+	if (defender_stats->weapon == nullptr){
+        defender.n_attacks_ = 0;
+	}
+
 	return true;
 }