Cps 59 accept null

[JaviCerveraIngram]

• Added a few missing methods and properties.
• Accepted null on JSON fields of the response, to prevent an error commonly reported that the SDK is not capable of parsing the response given by Connect.
• Improved Fulfillment example of the documentation.

[codecov-io]

Codecov Report

Merging #76 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #76      +/-   ##
==========================================
+ Coverage   92.72%   92.74%   +0.02%     
==========================================
  Files          67       67              
  Lines        1910     1916       +6     
==========================================
+ Hits         1771     1777       +6     
  Misses        139      139

Impacted Files	Coverage Δ
connect/models/schemas.py	93.12% <100%> (+0.05%)	⬆️
connect/models/asset.py	96.22% <100%> (+0.14%)	⬆️

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[marcserrat]

Currently i don't like the fix:
a) Either you set the oones that basicly are populated
b) Either globally you relax all since you relay on the platform.

this way seams bit strange mixure