Fix restoring validation state of layout after template initialization

Author: jonmmease

Diff for: packages/python/plotly/plotly/basedatatypes.py

@@ -1951,9 +1951,8 @@ def _initialize_layout_template(self):
                 try:
                     template_dict = pio.templates[pio.templates.default]
                     self._layout_obj.template = template_dict
-                except Exception:
+                finally:
                     self._layout_obj._validate = self._validate
-                    raise
 
     @property
     def layout(self):