fix for list_all. It currently keeps looping forever (until the conne…

[joaquinvanschoren]

…ction breaks)

[codecov-io]

Codecov Report

Merging #390 into develop will decrease coverage by 0.06%.
The diff coverage is 0%.

@@             Coverage Diff             @@
##           develop     #390      +/-   ##
===========================================
- Coverage    89.11%   89.05%   -0.07%     
===========================================
  Files           32       32              
  Lines         2656     2658       +2     
===========================================
  Hits          2367     2367              
- Misses         289      291       +2

Impacted Files	Coverage Δ
openml/utils.py	61.7% <0%> (-2.75%)	⬇️

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