[FIX] base: allow proper override of config_parameter

Prior to this commit there was no way for a `res.config.settings` field
using a `config_parameter` and remove the `config_parameter` aspect.
After this commit, the parameter is ignored if it is falsy.

TaskId-2825096

X-original-commit: b0b62ee3e302b1a1d08d1c8a32bf297380a4f27b
Part-of: odoo/odoo#89806

odoo/addons/base/models/res_config.py

@@ -474,7 +474,7 @@ class ResConfigSettings(models.TransientModel, ResConfigModuleInstallationMixin)
                 if field.type not in ('boolean', 'selection'):
                     raise Exception("Field %s must have type 'boolean' or 'selection'" % field)
                 modules += IrModule._get(name[7:])
-            elif hasattr(field, 'config_parameter'):
+            elif hasattr(field, 'config_parameter') and field.config_parameter:
                 if field.type not in ('boolean', 'integer', 'float', 'char', 'selection', 'many2one', 'datetime'):
                     raise Exception("Field %s must have type 'boolean', 'integer', 'float', 'char', 'selection', 'many2one' or 'datetime'" % field)
                 configs.append((name, field.config_parameter))