do not set entrypoint when it is None

[bibaijin]

No description provided.

[codecov]

Codecov Report

Merging #55 into master will not change coverage.
The diff coverage is 66.66%.

@@           Coverage Diff           @@
##           master      #55   +/-   ##
=======================================
  Coverage   32.29%   32.29%           
=======================================
  Files          40       40           
  Lines        3502     3502           
=======================================
  Hits         1131     1131           
  Misses       2371     2371

Impacted Files	Coverage Δ
apis/utils.py	41.04% <ø> (ø)	⬆️
apis/tests/test_specs.py	100% <100%> (ø)	⬆️
apis/specs.py	70.02% <50%> (ø)	⬆️
apis/base_app.py	55.71% <75%> (ø)	⬆️

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