Fix a bug that was leading to zeros in the diff for states using rmmdiis.
Description
Fix a bug that was leading to zeros in the diff for states using rmmdiis. Closes #151 (closed)
News snippet
Fix a bug that was leading to zeros in the diff for states using rmmdiis.
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.