fix #416 extra_options cannot give None as value

[lucemia]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.71%. Comparing base (a506c0a) to head (2e42e22).
Report is 152 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #438   +/-   ##
=======================================
  Coverage   94.71%   94.71%           
=======================================
  Files          46       46           
  Lines        1834     1834           
=======================================
  Hits         1737     1737           
  Misses         97       97           

Flag	Coverage Δ
3.10	94.71% <100.00%> (ø)
3.11	94.71% <100.00%> (ø)
3.12	94.71% <100.00%> (ø)
3.13	94.71% <100.00%> (ø)

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Files with missing lines	Coverage Δ
src/ffmpeg/dag/io/_input.py	100.00% <ø> (ø)
src/ffmpeg/dag/io/_output.py	100.00% <ø> (ø)
src/ffmpeg/dag/io/output_args.py	100.00% <100.00%> (ø)
src/ffmpeg/types.py	100.00% <100.00%> (ø)

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[lucemia]

User must declare the dict,
maybe just remove the None value

[lucemia]

變得很麻煩