Fix tests on stopping the sampling

[yannikschaelte]

No description provided.

[codecov-io]

Codecov Report

Merging #267 into develop will increase coverage by 0.01%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop     #267      +/-   ##
===========================================
+ Coverage    83.36%   83.38%   +0.01%     
===========================================
  Files           85       85              
  Lines         4744     4731      -13     
===========================================
- Hits          3955     3945      -10     
+ Misses         789      786       -3

Impacted Files	Coverage Δ
pyabc/acceptor/pdf_norm.py	91.66% <100%> (+0.75%)	⬆️
pyabc/sampler/multicorebase.py	93.1% <100%> (+0.08%)	⬆️
pyabc/weighted_statistics.py	94.44% <0%> (+3.7%)	⬆️

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