fix: heatmaps always created and peak files absent

[alsmith151]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 18.98%. Comparing base (943ca80) to head (efa0f0c).
Report is 3 commits behind head on master.

❗ Current head efa0f0c differs from pull request most recent head 497bd1c

Please upload reports for the commit 497bd1c to get more accurate results.

Files	Patch %	Lines
seqnado/design.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #183      +/-   ##
==========================================
+ Coverage   18.93%   18.98%   +0.04%     
==========================================
  Files           7        7              
  Lines        1162     1159       -3     
==========================================
  Hits          220      220              
+ Misses        942      939       -3     

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