Do not error if Tabulator styler is undefined (#2785)

* Do not error if Tabulator styler is undefined

* Update changelog

* Fix if self.style is None

CHANGELOG.md

@@ -14,21 +14,22 @@ Enhancements:
 
 - Ensure user is warned if an extension was not loaded in time on server ([#2765](https://github.com/holoviz/panel/pull/2765))
 - Allow Viewer classes to be served ([#2768](https://github.com/holoviz/panel/pull/2768))
-- Add support for rendering `.ico` files and pathlib objects ([#2757](https://github.com/holoviz/panel/pull/2757))
+- Add support for rendering `.ico` files and `pathlib` objects ([#2757](https://github.com/holoviz/panel/pull/2757))
 
 Bug fixes:
 
 - Fixed export of vtk.js module ([#2562](https://github.com/holoviz/panel/pull/2562))
 - Fix broken `HTMLTemplateFormatter` on `Tabulator` ([#2730](https://github.com/holoviz/panel/pull/2730))
-- Fix serialization issues of Panel components on ReactiveHTML ([#2743](https://github.com/holoviz/panel/pull/2743))
+- Fix serialization issues of Panel components on `ReactiveHTML` ([#2743](https://github.com/holoviz/panel/pull/2743))
 - Ensure `FlexBox` behaves like a layout and makes its children discoverable ([#2779](https://github.com/holoviz/panel/pull/2779))
 - Ensure `Plotly` plots can be updated in tabs ([#2747](https://github.com/holoviz/panel/pull/2747))
 - Fix embedding of Panel apps in Flask ([#2727](https://github.com/holoviz/panel/pull/2727))
 - Ensure `Spinner` widget honors bounds when created from `Param` object ([#2740](https://github.com/holoviz/panel/pull/2740))
 - Ensure `Tabulator` style does not disappear after resize event ([#2770](https://github.com/holoviz/panel/pull/2770))
 - Fix `PeriodicCallback` errors ([#2764](https://github.com/holoviz/panel/pull/2764))
 - Fix syncing of boolean types with URL parameters ([#2758](https://github.com/holoviz/panel/pull/2758))
-- Ensure Tabulator `download_menu` applies kwargs to the filename `TextInput` ([#2763](https://github.com/holoviz/panel/pull/2764))
+- Ensure `Tabulator.download_menu` applies kwargs to the filename `TextInput` ([#2763](https://github.com/holoviz/panel/pull/2764))
+- Ensure `Tabulator` does not error when no Styler is defined ([#2785](https://github.com/holoviz/panel/pull/2785))
 
 Documentation:
 

doc/releases.md

@@ -14,13 +14,13 @@ Enhancements:
 
 - Ensure user is warned if an extension was not loaded in time on server ([#2765](https://github.com/holoviz/panel/pull/2765))
 - Allow Viewer classes to be served ([#2768](https://github.com/holoviz/panel/pull/2768))
-- Add support for rendering `.ico` files and pathlib objects ([#2757](https://github.com/holoviz/panel/pull/2757))
+- Add support for rendering `.ico` files and `pathlib` objects ([#2757](https://github.com/holoviz/panel/pull/2757))
 
 Bug fixes:
 
 - Fixed export of vtk.js module ([#2562](https://github.com/holoviz/panel/pull/2562))
 - Fix broken `HTMLTemplateFormatter` on `Tabulator` ([#2730](https://github.com/holoviz/panel/pull/2730))
-- Fix serialization issues of Panel components on ReactiveHTML ([#2743](https://github.com/holoviz/panel/pull/2743))
+- Fix serialization issues of Panel components on `ReactiveHTML` ([#2743](https://github.com/holoviz/panel/pull/2743))
 - Ensure `FlexBox` behaves like a layout and makes its children discoverable ([#2779](https://github.com/holoviz/panel/pull/2779))
 - Ensure `Plotly` plots can be updated in tabs ([#2747](https://github.com/holoviz/panel/pull/2747))
 - Fix embedding of Panel apps in Flask ([#2727](https://github.com/holoviz/panel/pull/2727))
@@ -29,6 +29,7 @@ Bug fixes:
 - Fix `PeriodicCallback` errors ([#2764](https://github.com/holoviz/panel/pull/2764))
 - Fix syncing of boolean types with URL parameters ([#2758](https://github.com/holoviz/panel/pull/2758))
 - Ensure Tabulator `download_menu` applies kwargs to the filename `TextInput` ([#2763](https://github.com/holoviz/panel/pull/2764))
+- Ensure `Tabulator` does not error when no Styler is defined ([#2785](https://github.com/holoviz/panel/pull/2785))
 
 Documentation:
 

panel/widgets/tables.py

@@ -855,7 +855,7 @@ def _length(self):
         return len(self._processed)
 
     def _get_style_data(self):
-        if self.value is None:
+        if self.value is None or self.style is None:
             return {}
         df = self._processed
         if self.pagination == 'remote':
@@ -866,6 +866,8 @@ def _get_style_data(self):
             styler = df.style
         except Exception:
             return {}
+        if styler is None:
+            return {}
         styler._todo = self.style._todo
         styler._compute()
         offset = len(self.indexes) + int(self.selectable in ('checkbox', 'checkbox-single'))