chore: codegen for not initializing body to empty

[trivikr]

Issue #, if available:
Refs: smithy-lang/smithy-typescript#118

Description of changes:
codegen for not initializing body to empty

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[codecov-io]

Codecov Report

Merging #852 into smithy-codegen will not change coverage.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           smithy-codegen     #852   +/-   ##
===============================================
  Coverage           92.36%   92.36%           
===============================================
  Files                 147      147           
  Lines                2907     2907           
  Branches              508      508           
===============================================
  Hits                 2685     2685           
  Misses                222      222

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