Command line export for subdatabase creates empty bib file

[Siedlerchr]

JabRef version

Latest development branch build (please note build date below)

Operating system

macOS

Details on version and operating system

No response

Checked with the latest development build

• I made a backup of my libraries before testing the latest development version.
• I have tested the latest development version and the problem persists

Steps to reproduce the behaviour

Originall repoted in the forum https://discourse.jabref.org/t/export-subdatabase-from-aux-file-on-macos-command-line/3516/3

I used the aux files from our test.

/Applications/JabRef.app/Contents/runtime/Contents/Home/bin/JabRef --nogui --debug --console --aux "paper.aux,outfile.bib" origin.bib

Messages are printed:```

keys in library 6
found in AUX file 2
resolved 2
not found 0
crossreferenced entries included 0
strings included 0

However, bib files is empty tmp fuke 

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