daemon: fix --claim_id with lbrynet claim search

For some reason, when using `claim_search`
with `--claim_id`, the arguments dictionary will also
contain `claim_ids` with an empty list, even if we didn't specify it.
```
lbrynet claim search --claim_id=8945573bcfcb7f8276187dfbb93545eac4ebf71a
```

Using both `claim_id` and `claim_ids` will raise a `ValueError`
exception so the daemon won't return a valid result
even if the claim ID is in fact valid.

So if `claim_id` exists, we need to discard `claim_ids`
if it is empty, before proceeding with the rest of the code.

On the other hand, if `claim_ids` is used, and `claim_id` is absent,
there will be no problem as `claim_id` won't be added to the dictionary.
```
lbrynet claim search --claim_ids=8945573bcfcb7f8276187dfbb93545eac4ebf71a
```

lbry/extras/daemon/daemon.py

@@ -2479,6 +2479,8 @@ class Daemon(metaclass=JSONRPCServerType):
         Returns: {Paginated[Output]}
         """
         wallet = self.wallet_manager.get_wallet_or_default(kwargs.pop('wallet_id', None))
+        if "claim_ids" in kwargs and not kwargs["claim_id"]:
+            kwargs.pop("claim_ids")
         if {'claim_id', 'claim_ids'}.issubset(kwargs):
             raise ValueError("Only 'claim_id' or 'claim_ids' is allowed, not both.")
         if kwargs.pop('valid_channel_signature', False):