Improve exception when creating a group channel with one recipient

discord/client.py

@@ -3153,10 +3153,13 @@ class Client:
         -----------
         \*recipients: :class:`~discord.abc.Snowflake`
             An argument :class:`list` of :class:`discord.User` to have in
-            your group.
+            your group. Groups cannot be created with only one person,
+            but they can be created with zero people.
 
         Raises
         -------
+        TypeError
+            Only one recipient was given.
         HTTPException
             Failed to create the group direct message.
 
@@ -3165,6 +3168,9 @@ class Client:
         :class:`.GroupChannel`
             The new group channel.
         """
+        if len(recipients) == 1:
+            raise TypeError('Cannot create a group with only one recipient')
+
         users: List[_Snowflake] = [u.id for u in recipients]
         state = self._connection
         data = await state.http.start_group(users)

discord/types/experiment.py

@@ -58,9 +58,7 @@ Filters = List[
         Tuple[Literal[3013771838], Tuple[Tuple[Literal[3013771838], List[int]]]],  # IDs
         Tuple[Literal[4148745523], Tuple[Tuple[Literal[4148745523], List[int]]]],  # HUB_TYPE
         Tuple[Literal[188952590], Tuple[Tuple[Literal[188952590], bool]]],  # VANITY_URL
-        Tuple[
-            Literal[2294888943], Tuple[Tuple[Literal[2690752156], int], Tuple[Literal[1982804121], int]]
-        ],  # RANGE_BY_HASH
+        Tuple[Literal[2294888943], Tuple[Tuple[Literal[2690752156], int], Tuple[Literal[1982804121], int]]],  # RANGE_BY_HASH
     ]
 ]