Fix action_type = None with partial vision

[lmh-leo]

运行部分视角时出现bug， gobigger\bin\play.py第177行修改

[codecov[bot]]

Codecov Report

Merging #24 (d013e24) into main (0eca930) will decrease coverage by 0.02%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #24      +/-   ##
==========================================
- Coverage   91.82%   91.79%   -0.03%     
==========================================
  Files          55       55              
  Lines        3473     3473              
==========================================
- Hits         3189     3188       -1     
- Misses        284      285       +1     

Flag	Coverage Δ
unittests	91.79% <ø> (-0.03%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
gobigger/server/server.py	66.66% <0.00%> (-0.35%)	:arrow_down:

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[mingzhang96]

Thanks for your pr!