Cannot delete non default taxon trees

[emenslin]

Describe the bug
Originally implemented in 7.10.2 (#5456) but broke sometime in 7.11.2. Opening a new issue as there is a different error message now than there was before the first fix was implemented and labeling it as a regression as you used to be able to delete trees without error.

To Reproduce
Steps to reproduce the behavior:

1. Open trees -> taxon
2. Create a new or find an empty/non populated tree
3. Try to delete the tree
4. See error

Expected behavior
Should be able to delete a non-default taxon tree

Screenshots
7.11.1 (correct behavior):

12-17_14.47.mp4

7.11.2 (incorrect behavior):

12-17_14.52.mp4

Crash Report

Specify 7 Crash Report - 2025-12-17T20_52_57.341Z.txt

Please fill out the following information manually:

• OS: Windows 11
• Browser: Chrome
• Specify 7 Version: 7.11.2
• Database Name: ojsmnh
• Collection name: fossil invertebrates
• User Name: spadmin
• URL: https://ojsmnh20251211-main.test.specifysystems.org/specify/