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Bug fixes:
- Remove empty section from mxcheckouts.ini.
This is when calling `bin/manage remove-checkout`: when disabling a checkout, we can remove the entire section.
You must have `default-use = false` in the settings of this file.
The code is simplified to not support the default value of `default-use = true`: the Plone coredev buildout does not want this.
[maurits] (75)