Ensure markdown parsing does not choke on partial links

panel/pane/markup.py

@@ -440,9 +440,16 @@ def _transform_object(self, obj: Any) -> Dict[str, Any]:
                 **self.renderer_options
             )
         else:
-            html = self._get_parser(
+            parser = self._get_parser(
                 self.renderer, tuple(self.plugins), **self.renderer_options
-            ).render(obj)
+            )
+            try:
+                html = parser.render(obj)
+            except IndexError:
+                # Likely markdown-it mdurl parser error
+                with parser.reset_rules():
+                    parser.disable('link')
+                    html = parser.render(obj)
         return dict(object=escape(html))
 
     def _process_param_change(self, params):

panel/tests/pane/test_markup.py

@@ -101,7 +101,6 @@ def test_markdown_pane_newline(document, comm):
     assert pane._models[model.ref['id']][0] is model
     assert model.text == "<p>Hello\nWorld\nI'm here!</p>\n"
 
-
 def test_markdown_pane_markdown_it_renderer(document, comm):
     pane = Markdown("""
     - [x] Task1
@@ -122,6 +121,20 @@ def test_markdown_pane_markdown_it_renderer(document, comm):
         'type="checkbox"> Task2</li>\n</ul>\n'
     )
 
+def test_markdown_pane_markdown_it_renderer_partial_links(document, comm):
+    pane = Markdown("[Test](http:/", renderer='markdown-it')
+
+    model = pane.get_root(document, comm=comm)
+
+    assert model.text == '<p>[Test](http:/</p>\n'
+
+    pane.object = "[Test](http://"
+
+    assert model.text == '<p>[Test](http://</p>\n'
+
+    pane.object = "[Test](http://google.com)"
+    assert model.text == '<p><a href="http://google.com">Test</a></p>\n'
+
 def test_markdown_pane_extensions(document, comm):
     pane = Markdown("""
     ```python