Fix Zotero crash if last collection before a separator was deleted
Fix Zotero crash if last collection before a separator was deleted


sendecomp/zotero,hoehnp/zotero,robamler/zotero,sendecomp/zotero,egh/zotero,aurimasv/zotero,gracile-fr/zotero,hoehnp/zotero,LinuxMercedes/zotero,rmzelle/zotero,egh/zotero,robamler/zotero,adunning/zotero,egh/zotero,gracile-fr/zotero,LinuxMercedes/zotero,rmzelle/zotero,adunning/zotero,hoehnp/zotero,retorquere/zotero,sendecomp/zotero,fbennett/zotero,robamler/zotero,LinuxMercedes/zotero,rmzelle/zotero,adunning/zotero,gracile-fr/zotero,retorquere/zotero,retorquere/zotero