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
```
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