[feat] Crash on missing RTD

[slarse]

Fix #7

[codecov-io]

Codecov Report

Merging #48 into master will increase coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #48      +/-   ##
=========================================
+ Coverage   93.26%   93.3%   +0.04%     
=========================================
  Files           5       5              
  Lines         282     284       +2     
  Branches       34      35       +1     
=========================================
+ Hits          263     265       +2     
  Misses         12      12              
  Partials        7       7

Impacted Files	Coverage Δ
repobee_junit4/junit4.py	93.23% <100%> (+0.1%)	⬆️

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