add worker stats to error log
add worker stats to error log

retorquere/zotero-better-bibtex,retorquere/zotero-better-bibtex,ZotPlus/zotero-better-bibtex,ZotPlus/zotero-better-bibtex,retorquere/zotero-better-bibtex,retorquere/zotero-better-bibtex,ZotPlus/zotero-better-bibtex,retorquere/zotero-better-bibtex,retorquere/zotero-better-bibtex,ZotPlus/zotero-better-bibtex