[FIX] config: empty argument --foo= to disable

In the odoorc file, set a `logfile` path, but disable it via the command
line with `--logfile=`. The logs are output to the logfile configured in
the config file instead of stdout.

Parsing `--logile=` yield an empty string which was interpreted as
argument not set and skipped.

Closes #3852

closes odoo/odoo#60992

X-original-commit: bae0d99b8d654283be4d265e3b40a83247a2299c
Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>
Signed-off-by: Julien Castiaux <Julien00859@users.noreply.github.com>

odoo/tools/config.py

@@ -439,7 +439,7 @@ class configmanager(object):
         for arg in keys:
             # Copy the command-line argument (except the special case for log_handler, due to
             # action=append requiring a real default, so we cannot use the my_default workaround)
-            if getattr(opt, arg):
+            if getattr(opt, arg, None) is not None:
                 self.options[arg] = getattr(opt, arg)
             # ... or keep, but cast, the config file value.
             elif isinstance(self.options[arg], str) and self.casts[arg].type in optparse.Option.TYPE_CHECKER: