Fix return types in json commands (#3071)

* Fix return types in JSONCommands class

* Update CHANGES

Author: parmenashp

CHANGES

@@ -1,3 +1,4 @@
+    * Fix return types for `get`, `set_path` and `strappend` in JSONCommands
     * Connection.register_connect_callback() is made public.
     * Fix async `read_response` to use `disable_decoding`.
     * Add 'aclose()' methods to async classes, deprecate async close().

redis/commands/json/commands.py

@@ -173,7 +173,7 @@ def delete(self, key: str, path: Optional[str] = Path.root_path()) -> int:
 
     def get(
         self, name: str, *args, no_escape: Optional[bool] = False
-    ) -> List[JsonType]:
+    ) -> Optional[List[JsonType]]:
         """
         Get the object stored as a JSON value at key ``name``.
 
@@ -324,7 +324,7 @@ def set_path(
         nx: Optional[bool] = False,
         xx: Optional[bool] = False,
         decode_keys: Optional[bool] = False,
-    ) -> List[Dict[str, bool]]:
+    ) -> Dict[str, bool]:
         """
         Iterate over ``root_folder`` and set each JSON file to a value
         under ``json_path`` with the file name as the key.
@@ -377,7 +377,7 @@ def toggle(
         return self.execute_command("JSON.TOGGLE", name, str(path))
 
     def strappend(
-        self, name: str, value: str, path: Optional[int] = Path.root_path()
+        self, name: str, value: str, path: Optional[str] = Path.root_path()
     ) -> Union[int, List[Optional[int]]]:
         """Append to the string JSON value. If two options are specified after
         the key name, the path is determined to be the first. If a single