Tools: Improve handling of sequence_protocol in Python bindings generator.

This allows SequenceProtocol being initialized without all members which
simplifies Python authoring of binding files.

src/Tools/bindings/model/generateModel_Python.py

@@ -537,11 +537,8 @@ def _parse_class(class_node, source_code: str, path: str, imports_mapping: dict)
 
     # Attach sequence protocol metadata if provided.
     if sequence_protocol_kwargs is not None:
-        try:
-            seq_protocol = SequenceProtocol(**sequence_protocol_kwargs)
-            py_export.Sequence = seq_protocol
-        except Exception as e:
-            py_export.Sequence = None
+        seq_protocol = SequenceProtocol(**sequence_protocol_kwargs)
+        py_export.Sequence = seq_protocol
 
     py_export.Attribute.extend(class_attributes)
     py_export.Methode.extend(class_methods)

src/Tools/bindings/model/typedModel.py

@@ -144,16 +144,16 @@ class SequenceProtocol:
     All attributes are required booleans.
     """
 
-    sq_length: bool
-    sq_concat: bool
-    sq_repeat: bool
-    sq_item: bool
-    mp_subscript: bool
-    sq_ass_item: bool
-    mp_ass_subscript: bool
-    sq_contains: bool
-    sq_inplace_concat: bool
-    sq_inplace_repeat: bool
+    sq_length: bool = False
+    sq_concat: bool = False
+    sq_repeat: bool = False
+    sq_item: bool = False
+    mp_subscript: bool = False
+    sq_ass_item: bool = False
+    mp_ass_subscript: bool = False
+    sq_contains: bool = False
+    sq_inplace_concat: bool = False
+    sq_inplace_repeat: bool = False
 
 
 @dataclass