Allow empty enabled
and disabled
keys in caching configuration
#3330
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Fixes #3329
If the
enabled
ordisabled
key is specified in the cachingconfiguration but contains no values, or all values are commented, the
parsed dictionary will have
None
as the value for the correspondingkey. This was causing an exception in
aiida.manage.caching._get_config
because it was always iterating over it without checking that it exactly
contained an iterable.