Handle missing store directories better

[travisbrown]

No description provided.

[codecov-commenter]

Codecov Report

Merging #50 (0d3ee4c) into main (1c662cd) will increase coverage by 0.08%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##             main      #50      +/-   ##
==========================================
+ Coverage   25.18%   25.26%   +0.08%     
==========================================
  Files          45       45              
  Lines        2903     2909       +6     
==========================================
+ Hits          731      735       +4     
- Misses       2172     2174       +2     

Impacted Files	Coverage Δ
src/wayback/store.rs	75.87% <66.66%> (-0.12%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1c662cd...0d3ee4c. Read the comment docs.