More Typing.

[jjnicola]

• Add typing to db.py
• Improve typing in nvticache.py

[codecov]

Codecov Report

Merging #162 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #162      +/-   ##
==========================================
+ Coverage   71.28%   71.31%   +0.02%     
==========================================
  Files           4        4              
  Lines        1010     1011       +1     
==========================================
+ Hits          720      721       +1     
  Misses        290      290

Impacted Files	Coverage Δ
ospd_openvas/nvticache.py	96.33% <100%> (-0.07%)	⬇️
ospd_openvas/db.py	98.98% <100%> (+0.01%)	⬆️

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[bjoernricks]

Looks very good. I am not sure about some Optional returns because the haven't been mentioned in the docstrings but I guess you have checked them :-)

[jjnicola]

Looks very good. I am not sure about some Optional returns because the haven't been mentioned in the docstrings but I guess you have checked them :-)

The returns were indeed checked. If a key is empty or it does not exists, redis return None. Therefore someones are optional.