Fix join calls not raise RuntimeError after queue closing.

[linw1995]

What do these changes do?

Fix join() method calls not raise RuntimeError after queue closing.

Are there changes in behavior for the user?

The join() method calls will raise RuntimeError after queue closing.

Related issue number

#294

Checklist

• I think the code is well written
• Unit tests for the changes exist

[codecov]

Codecov Report

Merging #295 into master will increase coverage by 0.21%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #295      +/-   ##
==========================================
+ Coverage   95.30%   95.52%   +0.21%     
==========================================
  Files           4        4              
  Lines        1215     1274      +59     
  Branches       84       84              
==========================================
+ Hits         1158     1217      +59     
  Misses         50       50              
  Partials        7        7              

Flag	Coverage Δ
#unit	95.52% <100.00%> (+0.21%)	⬆️

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Impacted Files	Coverage Δ
janus/__init__.py	99.68% <100.00%> (+<0.01%)	⬆️
tests/test_mixed.py	100.00% <100.00%> (ø)

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[asvetlov]

LGTM!