fix empty stat file

[lpantano]

thanks @leontienvdbent #61

[codecov]

Codecov Report

Merging #62 into master will increase coverage by 0.41%.
The diff coverage is 60%.

@@            Coverage Diff            @@
##           master     #62      +/-   ##
=========================================
+ Coverage   62.99%   63.4%   +0.41%     
=========================================
  Files          40      40              
  Lines        3748    3744       -4     
=========================================
+ Hits         2361    2374      +13     
+ Misses       1387    1370      -17

Impacted Files	Coverage Δ
mirtop/gff/stats.py	74.15% <100%> (+15.73%)	⬆️
test/test_automated_analysis.py	92.94% <50%> (+1.1%)	⬆️

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