Fix handling of default value for the 'delayed' param

Aurélien COUDERCrequested to merge
fix-delayed-param into main

Fix handling of default value for the 'delayed' param.

ConfigParser doesn’t seem to support defaulting to None so I’ve just removed

    config.set('DEFAULT', 'delayed', "")

As the --delayed parameter has a difference between --delayed 0 and being absent we need to make it explicit that it is not set.

This solution is maybe not the cleanest since it removes the 'delayed' config option from the list of explicit defaults in read_config().

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