handling some errors

lnbits/extensions/boltcards/crud.py

@@ -171,6 +171,9 @@ async def get_hit(hit_id: str) -> Optional[Hit]:
 
 
 async def get_hits(cards_ids: Union[str, List[str]]) -> List[Hit]:
+    if len(cards_ids) == 0:
+        return []
+
     q = ",".join(["?"] * len(cards_ids))
     rows = await db.fetchall(
         f"SELECT * FROM boltcards.hits WHERE card_id IN ({q})", (*cards_ids,)
@@ -265,6 +268,9 @@ async def get_refund(refund_id: str) -> Optional[Refund]:
 
 
 async def get_refunds(hits_ids: Union[str, List[str]]) -> List[Refund]:
+    if len(hits_ids) == 0:
+        return []
+
     q = ",".join(["?"] * len(hits_ids))
     rows = await db.fetchall(
         f"SELECT * FROM boltcards.refunds WHERE hit_id IN ({q})", (*hits_ids,)