[Bug] Citekey is undefined

[WvW-vOiDs]

Some items don't have its citekey, even if the citekey is defined in Zotero.

The versions of the software and plugins are:

• ZotLit (Obsidian): 1.1.8
• Better BibTex for Zotero: 6.7.222
• Obsidian: 1.6.7
• Zotero: 7.0.1

I think it may be the same bug as #303.

Finally, thanks for the amazing plugin. It really helps me a lot.