protobuf: drop kwargs from constructors

tools/pb2py

@@ -76,16 +76,17 @@ def process_message_imports(descriptor):
 def create_init_method(fields):
     yield         "    def __init__("
     yield         "        self,"
-    for field in fields:
+    for field in fields[:-1]:
         yield     "        %s: %s = None," % (field.name, field.py_type)
-    yield         "        **kwargs"
+    # last field must not have a traling comma
+    yield         "        %s: %s = None" % (fields[-1].name, fields[-1].py_type)
     yield         "    ) -> None:"
+
     for field in fields:
         if field.repeated:
             yield "        self.{0} = {0} if {0} is not None else []".format(field.name)
         else:
             yield "        self.{0} = {0}".format(field.name)
-    yield         "        super().__init__(**kwargs)"
 
 
 def process_message(descriptor, protobuf_module, msg_id, is_upy):
@@ -113,6 +114,9 @@ def process_message(descriptor, protobuf_module, msg_id, is_upy):
     yield ""
     yield "class %s(p.MessageType):" % descriptor.name
 
+    if msg_id is not None:
+        yield "    MESSAGE_WIRE_TYPE = %d" % msg_id
+
     if fields:
         yield "    FIELDS = {"
         for field in fields:
@@ -135,12 +139,11 @@ def process_message(descriptor, protobuf_module, msg_id, is_upy):
             yield "        %d: ('%s', %s, %s),%s" % (field.number, field.name, field.proto_type, flags, comment)
 
         yield "    }"
+        yield ""
+        yield from create_init_method(fields)
 
-    if msg_id is not None:
-        yield "    MESSAGE_WIRE_TYPE = %d" % msg_id
-
-    yield ""
-    yield from create_init_method(fields)
+    if not fields and not msg_id:
+        yield "    pass"
 
 
 def process_enum(descriptor, is_upy):