Fix exception when parsing groups which contain a top level group #2611
+35
−3
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Fixes the import of #2600
The problem occurred when after the definition of a subgroup of level >0 a group definition with level 0 followed.
- [ ] Screenshots added (for bigger UI changes)- [ ] Check documentation status (Issue created for outdated help page at [help.jabref.org](https://github.com/JabRef/help.jabref.org/issues)?)- [ ] If you changed the localization: Did you rungradle localizationUpdate
?