Fix error for initless classes

typon/trans/transpiler/phases/emit_cpp/module.py

@@ -124,11 +124,12 @@ class ModuleVisitorExt(NodeVisitor):
 
     def visit_ClassDef(self, node: ast.ClassDef) -> Iterable[str]:
         yield f"py::class_<PROGRAMNS::{node.name}_s::py_type>(m, \"{node.name}\")"
-        init = node.type.fields["__init__"].type.resolve().remove_self()
-        init_params = init.parameters
-        yield ".def(py::init<"
-        yield from join(", ", map(self.visit, init_params))
-        yield ">())"
+        if init := node.type.fields.get("__init__", None):
+            init = init.type.resolve().remove_self()
+            init_params = init.parameters
+            yield ".def(py::init<"
+            yield from join(", ", map(self.visit, init_params))
+            yield ">())"
         yield f'.def("__repr__", [](const PROGRAMNS::{node.name}_s::py_type& self)'
         yield "{ return repr(self); })"
         for f, v in node.type.fields.items():