Fix error for initless classes

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

@@ -124,7 +124,8 @@ 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()
+        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))