Show proper error message when .bib file contains git (or SVN) conflict markers

[enochytchen]

JabRef version

5.7 (latest release)

Operating system

macOS

Details on version and operating system

macOS 12.2.1

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

1. I tried to import a bib file from my drive. (Open library -> select bib file -> Open
2. It showed "Connection error. For input string: "<<<<<<<<<<<". A local copy will be opened.
   

Appendix

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Log File

Paste an excerpt of your log file here

[Siedlerchr]

Hi, seems like something is wrong with your bib file. It seems the bib file is connected to a shared database that cannot be opened correctly.

The issue could also be coming from a merge conflict with git. Can you attach your bib file or send it privately to web@jabref.org ?