fix: check requestHeader content-type property

[daern91]

Summary

It's possible that request.headers is undefined, which will throw when we then check the properties. PR fixes this by checking requestHeader instead as it's will be an empty object {} in the case of request.headers=undefined

resolves #1673

Todo

• Tests
  • Unit
  • Integration
  • Acceptance
• Documentation
• Type label for the PR

[codecov]

Codecov Report

Merging #1674 (273cd63) into master (4974bb7) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1674   +/-   ##
=======================================
  Coverage   98.64%   98.64%           
=======================================
  Files         128      128           
  Lines        3385     3385           
  Branches      781      781           
=======================================
  Hits         3339     3339           
  Misses         42       42           
  Partials        4        4           

Impacted Files	Coverage Δ
packages/sdk-middleware-http/src/http.js	97.67% <100.00%> (ø)

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