Fix #664 fixing coverage

[NimaSarajpoor]

This PR fixes the coverage issue raised in the PR #665, related to issue #664.

[NimaSarajpoor]

@seanlaw
When you notice all tests are passing, you may want to take a look and see if the inline comments are okay or not. I did as follows:

else # pragma: no cover  # AB-join  

I think it fixes the coverage; however, I am not sure if you prefer to remove the second comment # AB-join or not.

[codecov-commenter]

Codecov Report

Merging #666 (859a3a1) into main (bcc5b02) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #666      +/-   ##
==========================================
+ Coverage   99.87%   99.89%   +0.01%     
==========================================
  Files          80       80              
  Lines       11455    11453       -2     
==========================================
  Hits        11441    11441              
+ Misses         14       12       -2     

Impacted Files	Coverage Δ
stumpy/scraamp.py	100.00% <ø> (+0.70%)	⬆️
stumpy/scrump.py	100.00% <ø> (+0.68%)	⬆️

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[seanlaw]

When you notice all tests are passing, you may want to take a look and see if the inline comments are okay or not

Yeah, I noticed it originally and it didn't bother me a ton and I would've done the same thing as you. 😄

[seanlaw]

Thanks @NimaSarajpoor