Bugfix: td_occup with states parallelization and isolated systems
Description
Fix various problems related to the header of td_occup output for isolated systems in states parallelization.
News snippet
Fix various problems related to the header of td_occup output for isolated systems in states parallelization.
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.