Auth configure fix

[powerful23]

Issue #, if available:
To return an empty object instead of undefined if auth is not configured.
Description of changes:

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 #714 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #714   +/-   ##
=======================================
  Coverage   87.03%   87.03%           
=======================================
  Files          74       74           
  Lines        3495     3495           
  Branches      668      668           
=======================================
  Hits         3042     3042           
  Misses        436      436           
  Partials       17       17

Impacted Files	Coverage Δ
packages/aws-amplify/src/Auth/Auth.ts	88.52% <100%> (ø)	⬆️

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[richardzcode]

👍

[github-actions]

This pull request has been automatically locked since there hasn't been any recent activity after it was closed. Please open a new issue for related bugs.

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