fix: throw error when method authorizer is present and api auth is no…

[ShreyaGangishetty]

…t defined

Issue #, if available:
#1240

Description of changes:
added a check to see if api auth section is defined

Description of how you validated changes:

Checklist:

• Write/update tests
• make pr passes
• Update documentation
• Verify transformed template deploys and application functions as expected
• Add/update example to examples/2016-10-31

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-io]

Codecov Report

Merging #1282 into develop will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           develop   #1282      +/-   ##
==========================================
+ Coverage    94.49%   94.5%   +<.01%     
==========================================
  Files           72      72              
  Lines         3745    3746       +1     
  Branches       741     742       +1     
==========================================
+ Hits          3539    3540       +1     
  Misses         104     104              
  Partials       102     102

Impacted Files	Coverage Δ
samtranslator/model/eventsources/push.py	89.83% <100%> (+0.02%)	⬆️

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