Using a whole-file default value for region

[kafkasl]

Description

Due to recent modifications to app.js setting up the AWS_DEFAULT_REGION env variable was required. The error was very obscure, because when creating the lambda function is uses a default with region: process.env.AWS_DEFAULT_REGION || 'eu-west-1'. However, when adding the variable to the template it does not (which is the latest addition) causing the pipeline to fail once it started.

I modified the code to set the default for the whole file instead of just for one of the cases.

Details

URL to issue

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Link to staging deployment URL (or set N/A)

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Links to any PRs or resources related to this PR

Integration test branch

master

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Code updates

Have best practices and ongoing refactors being observed in this PR

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[codecov]

Codecov Report

Merging #326 (6492db7) into master (5345e5f) will not change coverage.
Report is 4 commits behind head on master.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #326   +/-   ##
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  Coverage   79.54%   79.54%           
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  Files          29       29           
  Lines        2821     2821           
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  Hits         2244     2244           
  Misses        577      577