BibTeX citation key generator broken for items with no author specified

Since the zotero BibTeX citation key generator uses the format %(author)_%(1st word of title)_%(year), it produces a key with a leading _ for any item where no author is given. This is "illegal" in LaTeX and leads to an error when using this citation key.

Items without an author are imho a very common case e.g. for manuals. The citation key generator should be able to handle this case.
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