[#4554] ClausePresenter: don't attempt to call #display_label on a non-existant field configuration #4559
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This fixes an error that appeared when a user specified a search field that does not exist. It is essentially the same as upstream fix projectblacklight/blacklight#3442, so if that is accepted and we start using a Blacklight release that includes it, we can remove our customized version.
Closes #4554