fix claim apis failing with --resolve if no claims are present

fixes https://github.com/lbryio/lbry-sdk/issues/2802

lbry/wallet/ledger.py

@@ -630,7 +630,8 @@ class Ledger(metaclass=LedgerRegistry):
                     raise asyncio.TimeoutError('Timed out waiting for transaction.')
 
     async def _inflate_outputs(self, query, accounts) -> Tuple[List[Output], dict, int, int]:
-        outputs = Outputs.from_base64(await query)
+        encoded_outputs = await query
+        outputs = Outputs.from_base64(encoded_outputs or b'')  # TODO: why is the server returning None?
         txs = []
         if len(outputs.txs) > 0:
             txs: List[Transaction] = await asyncio.gather(*(

tests/integration/blockchain/test_claim_commands.py

@@ -403,6 +403,8 @@ class ClaimCommands(ClaimTestCase):
         self.assertEqual({'stream', 'channel'}, {c['value_type'] for c in r})
 
     async def test_claim_stream_channel_list_with_resolve(self):
+        self.assertListEqual([], await self.claim_list(resolve=True))
+
         await self.channel_create()
         await self.stream_create()