option merge-other does not work for non-ADS items

[syrte]

It seems that the option "merge-other" (introduced in #10) does not work for non-ADS items in current adstex.

For example, I cited a book Bishop2006, which is in my personal bib file mylib.bib. Now I want to generate bib file for my paper main.tex. When I run

adstex --force-regenerate --merge-other -o main.bib -r mylib.bib  -P main.tex

In the terminal, adstex prompts

Bishop2006: FOUND IN OTHER BIB SOURCE, MERGED

But in the generated bib file main.bib, Bishop2006 is not there. Clearly, it skipped the "merge" operation...

In contrast, for those normal ads papers in mylib.bib, adstex prompts

Binney2011: FOUND IN SECONDARY BIB SOURCES, UPDATE => 2011MNRAS.413.1889B

And it indeed appears in the generated main.bib as expected.

---

For reference, the two bib items are attached.

@book{Bishop2006,
  title = {Pattern {{Recognition}} and {{Machine Learning}}},
  author = {Bishop, Christopher M.},
  year = {2006},
  month = aug,
  publisher = {Springer},
  address = {New York},
  isbn = {978-0-387-31073-2},
  langid = {english}
}

@article{Binney2011,
  title = {Models of Our {{Galaxy}} - {{II}}},
  author = {Binney, James and McMillan, Paul},
  year = {2011},
  month = may,
  journal = {Monthly Notices of the Royal Astronomical Society},
  volume = {413},
  pages = {1889--1898},
  issn = {0035-8711},
  doi = {10.1111/j.1365-2966.2011.18268.x},
  urldate = {2023-02-15},
  keywords = {Astrophysics - Astrophysics of Galaxies,galaxies: kinematics and dynamics,Galaxy: disc,Galaxy: kinematics and dynamics,Galaxy: structure},
  annotation = {ADS Bibcode: 2011MNRAS.413.1889B}
}

[yymao]

Fixed by #45