Fix for the test test_manager

[dmitry-ganyushin]

Short description of the changes:

Long description of the changes:

Check list for the pull request

• [X ] I have read the [CONTRIBUTING]
• [ X] I have read the [CODE_OF_CONDUCT]
• I have added tests for my changes
• I have updated the documentation accordingly

Check list for the reviewer

• I have read the [CONTRIBUTING]
• I have verified the proposed changes
• best software practices
  • all internal functions have an underbar, as is python standard
  • clearly named variables (better to be verbose in variable names)
  • code comments explaining the intent of code blocks
• All the tests are passing
• The documentation is up to date
• code comments added when explaining intent

Manual test for the reviewer

References

[dmitry-ganyushin]

5295: [QuickNSX] test test_manager skipped

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 35.41%. Comparing base (7f4ceab) to head (a2bf8d1).

Files	Patch %	Lines
reflectivity_ui/interfaces/data_manager.py	0.00%	2 Missing ⚠️
...ectivity_ui/interfaces/data_handling/instrument.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             next      #90   +/-   ##
=======================================
  Coverage   35.41%   35.41%           
=======================================
  Files          30       30           
  Lines        6091     6091           
=======================================
  Hits         2157     2157           
  Misses       3934     3934           

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[jmborr]

looks 👌