Better handling of filling empty slots.

src/Battling/Models/BattleSide.cpp

@@ -7,6 +7,17 @@ using namespace CreatureLib::Battling;
 
 bool BattleSide::AllChoicesSet() const { return _choicesSet == _creaturesPerSide; }
 
+bool BattleSide::AllPossibleSlotsFilled() const {
+    for (size_t i = 0; i < _creatures.size(); i++) {
+        auto c = _creatures[i];
+        if (c == nullptr || c->IsFainted()) {
+            if (_battle->CanSlotBeFilled(_index, i))
+                return false;
+        }
+    }
+    return true;
+}
+
 void BattleSide::ResetChoices() {
     _choicesSet = 0;
     for (uint8_t i = 0; i < _creaturesPerSide; i++) {