PYTHON: Json.nummultby update (#2578)

Signed-off-by: Muhammad Awawdi <Mawawdi@amazon.com>

python/python/glide/async_commands/server_modules/json.py

@@ -733,7 +733,7 @@ async def nummultby(
     key: TEncodable,
     path: TEncodable,
     number: Union[int, float],
-) -> Optional[bytes]:
+) -> bytes:
     """
     Multiplies the JSON value(s) at the specified `path` by `number` within the JSON document stored at `key`.
 
@@ -744,7 +744,7 @@ async def nummultby(
         number (Union[int, float]): The number to multiply by.
 
     Returns:
-        Optional[bytes]:
+        bytes:
             For JSONPath (`path` starts with `$`):
                 Returns a bytes string representation of an array of bulk strings, indicating the new values after multiplication for each matched `path`.
                 If a value is not a number, its corresponding return value will be `null`.
@@ -767,7 +767,7 @@ async def nummultby(
     """
     args = ["JSON.NUMMULTBY", key, path, str(number)]
 
-    return cast(Optional[bytes], await client.custom_command(args))
+    return cast(bytes, await client.custom_command(args))
 
 
 async def objlen(

python/python/tests/tests_server_modules/test_json.py

@@ -766,6 +766,10 @@ async def test_json_nummultby(self, glide_client: TGlideClient):
         result = await json.get(glide_client, key, "$..key1")  # type: ignore
         assert result == b"[-16500,[140,175],1380]"
 
+        # Check 'null' in legacy
+        with pytest.raises(RequestError):
+            await json.nummultby(glide_client, key, ".key7", 5)
+
         # Check for non-existent path in legacy
         with pytest.raises(RequestError):
             await json.nummultby(glide_client, key, ".key10", 51)