Improve check error messages in merge

[maxnoe]

No description provided.

[codecov]

Codecov Report

Merging #868 (348115f) into master (94f3170) will decrease coverage by 0.20%.
The diff coverage is 27.58%.

@@            Coverage Diff             @@
##           master     #868      +/-   ##
==========================================
- Coverage   85.46%   85.25%   -0.21%     
==========================================
  Files          75       75              
  Lines        5856     5875      +19     
==========================================
+ Hits         5005     5009       +4     
- Misses        851      866      +15     

Impacted Files	Coverage Δ
lstchain/io/io.py	72.59% <27.58%> (-2.19%)	⬇️

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