Bugfix: load QpointPhononModes with one q-point from JSON

[ajjackson]

Closes #292

[github-actions]

Test Results

0 files   -     21  0 suites   - 21   0s ⏱️ - 1h 21m 25s
0 tests  -  1 049  0 ✅  -  1 043  0 💤  -   6  0 ❌ ±0 
0 runs   - 21 903  0 ✅  - 21 777  0 💤  - 126  0 ❌ ±0 

Results for commit 89e41c6. ± Comparison against base commit 0080886.

♻️ This comment has been updated with latest results.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0080886) 95.85% compared to head (89e41c6) 95.85%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #293   +/-   ##
=======================================
  Coverage   95.85%   95.85%           
=======================================
  Files          28       28           
  Lines        3982     3982           
  Branches      803      803           
=======================================
  Hits         3817     3817           
  Misses         97       97           
  Partials       68       68           

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