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* Avoid setting an empty value on slash command IconURL When `PostEnablePostIconOverride` is enabled and no icon URL is provided, the override icon URL was being set to empty and triggering a warning. This change updates the behavior not to set the icon at all, avoiding the triggering of the warn message while keeping the behavior. * Adds an additional check to the test --------- Co-authored-by: Miguel de la Cruz <miguel@ctrlz.es>