[FIX] base: make data argument optional

It was not always set (e.g. in the generate_email call of
mail.template) and it executes methods like _render_qweb_html where
data was already optional.

closes odoo/odoo#103840

X-original-commit: ddb2bf9f9cb6ea3a4bbdc4fb68c7fbcb0e66aa43
Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>

odoo/addons/base/models/ir_actions_report.py

@@ -888,7 +888,7 @@ class IrActionsReport(models.Model):
         return data
 
     @api.model
-    def _render(self, report_ref, res_ids, data):
+    def _render(self, report_ref, res_ids, data=None):
         report = self._get_report(report_ref)
         report_type = report.report_type.lower().replace('-', '_')
         render_func = getattr(self, '_render_' + report_type, None)