fix claim search by fee for claims without fees

lbry/wallet/server/leveldb.py

@@ -490,7 +490,7 @@ class LevelDB:
         if not metadata:
             return
         if not metadata.is_stream or not metadata.stream.has_fee:
-            fee_amount = None
+            fee_amount = 0
         else:
             fee_amount = int(max(metadata.stream.fee.amount or 0, 0) * 1000)
             if fee_amount >= 9223372036854775807:

tests/integration/blockchain/test_resolve_command.py

@@ -562,6 +562,44 @@ class ResolveClaimTakeovers(BaseResolveTestCase):
         await self.assertNoClaimForName(name)
         await self._test_activation_delay()
 
+    async def test_resolve_signed_claims_with_fees(self):
+        channel_name = '@abc'
+        channel_id = self.get_claim_id(
+            await self.channel_create(channel_name, '0.01')
+        )
+        self.assertEqual(channel_id, (await self.assertMatchWinningClaim(channel_name)).claim_hash.hex())
+        stream_name = 'foo'
+        stream_with_no_fee = self.get_claim_id(
+            await self.stream_create(stream_name, '0.01', channel_id=channel_id)
+        )
+        stream_with_fee = self.get_claim_id(
+            await self.stream_create('with_a_fee', '0.01', channel_id=channel_id, fee_amount='1', fee_currency='LBC')
+        )
+        greater_than_or_equal_to_zero = [
+            claim['claim_id'] for claim in (
+                await self.conductor.spv_node.server.bp.db.search_index.search(
+                    channel_id=channel_id, fee_amount=">=0"
+                ))[0]
+        ]
+        self.assertEqual(2, len(greater_than_or_equal_to_zero))
+        self.assertSetEqual(set(greater_than_or_equal_to_zero), {stream_with_no_fee, stream_with_fee})
+        greater_than_zero = [
+            claim['claim_id'] for claim in (
+                await self.conductor.spv_node.server.bp.db.search_index.search(
+                    channel_id=channel_id, fee_amount=">0"
+                ))[0]
+        ]
+        self.assertEqual(1, len(greater_than_zero))
+        self.assertSetEqual(set(greater_than_zero), {stream_with_fee})
+        equal_to_zero = [
+            claim['claim_id'] for claim in (
+                await self.conductor.spv_node.server.bp.db.search_index.search(
+                    channel_id=channel_id, fee_amount="<=0"
+                ))[0]
+        ]
+        self.assertEqual(1, len(equal_to_zero))
+        self.assertSetEqual(set(equal_to_zero), {stream_with_no_fee})
+
     async def test_early_takeover(self):
         name = 'derp'
         # block 207