[IMP] base: clarify view error position

In case of syntax error, show where the error is.
e.message is enmpty for syntax errors

Before:
Can't validate view:

After:
Can't validate view:
SyntaxError('invalid syntax', ('', 1, 51, "{'invisible': [('external_sale', '=', 'internal')]]}"))

odoo/addons/base/ir/ir_ui_view.py

@@ -1168,4 +1168,4 @@ actual arch.
             try:
                 self.browse(vid)._check_xml()
             except Exception as e:
-                self.raise_view_error("Can't validate view: %s" % e.message, vid)
+                self.raise_view_error("Can't validate view:\n%s" % (e.message or repr(e)), vid)