fix: GET calls fail with swagger client because of empty body in calls

[sandeep-paliwal]

Fixes #29
Fixed issue with latest swagger client throwing error for empty body for get calls.

Description

Related Issue

Motivation and Context

How Has This Been Tested?

unit tests

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[shazron]

tests failing because of linter issue

[codecov]

Codecov Report

Merging #30 (463ee97) into master (9e5562c) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #30   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines          133       135    +2     
  Branches        25        26    +1     
=========================================
+ Hits           133       135    +2     

Impacted Files	Coverage Δ
src/openApiSDK.js	100.00% <100.00%> (ø)

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