Test whether exportCharset is set, assume non-utf-8 if it isn't
Test whether exportCharset is set, assume non-utf-8 if it isn't

egh/zotero-better-bibtex,maxxk/zotero-better-bibtex,egh/zotero-better-bibtex,gracile-fr/zotero-better-bibtex,davepwsmith/zotero-better-bibtex,egh/zotero-better-bibtex,gracile-fr/zotero-better-bibtex,maxxk/zotero-better-bibtex,davepwsmith/zotero-better-bibtex,egh/zotero-better-bibtex,maxxk/zotero-better-bibtex