[FIX] base: prevent traceback while invalid context pass

This issue occurs when a customer passes an invalid context in the view, at that
time this error will be generated.

Steps To Produce:-
- Go to `Settings >Technical >User Interface >Views`
- Open any view
- pass invalid context like
`context="{'search_default_demo': active_id}, 'search_default_x_stage_id':[3]}"`
-error will be generated

error-SyntaxError
unmatched '}' (<unknown>, line 1)

after this commit, we can display Validation Errors to users instead of a
traceback when they make mistakes in any UI view.

sentry-4684090820

closes odoo/odoo#145193

Signed-off-by: Rémy Voet (ryv) <ryv@odoo.com>

odoo/addons/base/i18n/base.pot

@@ -18161,6 +18161,16 @@ msgstr ""
 msgid "Invalid composed field %(definition)s in %(use)s"
 msgstr ""
 
+#. module: base
+#. odoo-python
+#: code:addons/base/models/ir_ui_view.py:0
+#, python-format
+msgid ""
+"Invalid context: %(expr)r is not a valid Python expression \n"
+"\n"
+" %(e)s"
+msgstr ""
+
 #. module: base
 #. odoo-python
 #: code:addons/base/models/ir_fields.py:0

odoo/addons/base/models/ir_ui_view.py

@@ -1646,7 +1646,11 @@ actual arch.
                 self._validate_classes(node, expr)
 
             elif attr == 'context':
-                vnames = get_expression_field_names(expr) - {'id'}
+                try:
+                    vnames = get_expression_field_names(expr) - {'id'}
+                except SyntaxError as e:
+                    message = _('Invalid context: %(expr)r is not a valid Python expression \n\n %(e)s', expr=expr, e=e)
+                    self._raise_view_error(message)
                 if vnames:
                     name_manager.must_have_fields(node, vnames, f"context ({expr})")
                 for key, val_ast in get_dict_asts(expr).items():