fix pre-commit

[ltalirz]

• unused imports
• return after else
• remove unreachable code

Still to fix: _parse_bands uses new interface only available in cp2k
develop branch

[ltalirz]

@danieleongari This line was not reachable and I'm therefore removing it.
Let me know if that was unexpected

[ltalirz]

Furthermore, there is one instance of _parse_bands that takes a cp2k version, which is only available in the aiida-cp2k develop branch.

@danieleongari is it safe to use the latest version of the develop branch from aiida-cp2k (in which case I will try to get a new release of aiida-cp2k going) or are there other changes that one needs to watch out for?

[codecov-commenter]

Codecov Report

Merging #96 (65c5f95) into develop (0999cce) will increase coverage by 0.02%.
The diff coverage is 3.57%.

@@             Coverage Diff             @@
##           develop      #96      +/-   ##
===========================================
+ Coverage    70.61%   70.64%   +0.02%     
===========================================
  Files           34       34              
  Lines         2808     2807       -1     
===========================================
  Hits          1983     1983              
+ Misses         825      824       -1     

Impacted Files	Coverage Δ
aiida_lsmo/workchains/isotherm_accurate.py	18.62% <3.57%> (+0.07%)	⬆️

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