"Query is empty" error is displayed after attempt to open custom filter that was saved in "Tests Query Editor"

[dmytro-lgtm]

Describe the bug
Can't open custom filter that was saved in "Tests Query Editor"

To Reproduce

1. Click the "Query Language Editor" button
2. Enter label == 'Desktop' query and click the "Save" button
3. Enter the query name and click the "Save" button
4. Click saved filter link in the "Saved Queries" section

Actual result: "Error" pop-up with text "Query is empty" appears. Next console error is thrown:

Uncaught (in promise) Error: Illegal argument
    at p (editor.main.js:sourcemap:10:960)
    at Wt.setValue (editor.main.js:sourcemap:640:461)
    at e.StandaloneEditor.setValue (editor.main.js:sourcemap:655:97)
    at frame.js:sourcemap:1362:18
    at m._invokeFactory (loader.js:8:1491)
    at m.complete (loader.js:8:1706)
    at c._onModuleComplete (loader.js:9:1051)
    at c._resolve (loader.js:9:510)
    at c.defineModule (loader.js:8:5548)
    at r (loader.js:9:2178)

Expected behavior
The saved filter is shown

Screenshots

Desktop (please complete the following information):

• OS: MacOS 15.1.1
• Browser Chrome
• Browser Version 131.0.6778.86
• Application: production

Additional context
Add any other context about the problem here.