Currently, Curation Tasks do not support the ability to skip a single object (or list of objects) during processing.
However, this feature is available in filter-media (Media Filters) as the "-s" option: https://wiki.duraspace.org/display/DSDOC6x/Mediafilters+for+Transforming+DSpace+Content#MediafiltersforTransformingDSpaceContent-Executing(viaCommandLine)
Before Media Filters can be converted to Curation Tasks (see DS-3042), this feature would need to be implemented.
Similar to in Media Filters, the "skip" option is useful if a particular object is not processable by the Curation Task (or otherwise failing with an error). It allows you to manage that object(s) manually, while continuing to process all other objects.