Fix that sometimes an empty side pane is shown (#4105)
Fix that sometimes an empty side pane is shown (#4105)


JabRef/jabref,sauliusg/jabref,sauliusg/jabref,tobiasdiez/jabref,zellerdev/jabref,tobiasdiez/jabref,tobiasdiez/jabref,tobiasdiez/jabref,Siedlerchr/jabref,zellerdev/jabref,Siedlerchr/jabref,Siedlerchr/jabref,Siedlerchr/jabref,zellerdev/jabref,zellerdev/jabref,zellerdev/jabref,sauliusg/jabref,sauliusg/jabref,JabRef/jabref,JabRef/jabref,JabRef/jabref