Review system: improve robustness of method for status query

This commit adds the pre-condition that at least one skeleton ID has to be
provided. Otherwise a ValueError is raised.
Selection table: update review information on refresh

The neuron names are updated and neurons that are not existing anymore
are removed, when a user clicks the widget's "Refresh" button. However,
the review status was not updated. This commit fixes this and thereby
fixes #691.