Avoid NotImplementedError when qam is called without subcommand

[mimi1vx]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 33.33% and project coverage change: -0.08 ⚠️

Comparison is base (49c4d43) 69.22% compared to head (c341a48) 69.15%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #22      +/-   ##
==========================================
- Coverage   69.22%   69.15%   -0.08%     
==========================================
  Files          63       63              
  Lines        1836     1838       +2     
==========================================
  Hits         1271     1271              
- Misses        565      567       +2     

Impacted Files	Coverage Δ
oscqam/cli.py	0.00% <0.00%> (ø)
oscqam/__init__.py	100.00% <100.00%> (ø)

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