[FIX+IMP] account_financial_report: data can be None + no context mangling

Depending on the calling method, data can be something different from a dictionary
(like `None` if no keyword argument is provided), so this will crash. Example:
mis_builder is crashing in its tests.

We prevent that checking for a falsy value before trying to access the dictionary.

We also avoid context mangling for non AFR reports (those without the key
`account_financial_report_lang` in the dictionary), not callign to `with_context`
in that case.

account_financial_report/__manifest__.py

@@ -5,7 +5,7 @@
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 {
     "name": "Account Financial Reports",
-    "version": "13.0.1.3.1",
+    "version": "13.0.1.3.2",
     "category": "Reporting",
     "summary": "OCA Financial Reports",
     "author": "Camptocamp SA,"

account_financial_report/models/ir_actions_report.py

@@ -9,19 +9,17 @@ class IrActionsReport(models.Model):
 
     @api.model
     def _prepare_account_financial_report_context(self, data):
-        lang = data.get("account_financial_report_lang")
-        return dict(self.env.context or {}, lang=lang) if lang else self.env.context
+        lang = data and data.get("account_financial_report_lang") or ""
+        return dict(self.env.context or {}, lang=lang) if lang else False
 
     @api.model
     def render_qweb_html(self, docids, data=None):
-        return super(
-            IrActionsReport,
-            self.with_context(self._prepare_account_financial_report_context(data)),
-        ).render_qweb_html(docids, data)
+        context = self._prepare_account_financial_report_context(data)
+        obj = self.with_context(context) if context else self
+        return super(IrActionsReport, obj).render_qweb_html(docids, data)
 
     @api.model
     def render_xlsx(self, docids, data):
-        return super(
-            IrActionsReport,
-            self.with_context(self._prepare_account_financial_report_context(data)),
-        ).render_xlsx(docids, data)
+        context = self._prepare_account_financial_report_context(data)
+        obj = self.with_context(context) if context else self
+        return super(IrActionsReport, obj).render_xlsx(docids, data)