Add newline to GetGenericObject log line in testing

[lberk]

Related: #4634

Proposed Changes

• Add a newline at the end of the GetGenericObject() error message that may be causing a variety of our flakey tests

[codecov]

Codecov Report

Merging #4636 (e5a4407) into master (1d3519c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4636   +/-   ##
=======================================
  Coverage   81.31%   81.31%           
=======================================
  Files         290      290           
  Lines        8176     8176           
=======================================
  Hits         6648     6648           
  Misses       1128     1128           
  Partials      400      400           

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[pierDipi]

/test pull-knative-eventing-integration-tests
/test pull-knative-eventing-conformance-tests

[lionelvillard]

/lgtm
/approve

Thanks @lberk !!

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lberk, lionelvillard

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[lberk]

/test pull-knative-eventing-integration-tests

[zhongduo]

/lgtm

[lionelvillard]

/cherrypick release-0.19

[knative-prow-robot]

@lionelvillard: new pull request created: #4646

In response to this:

/cherrypick release-0.19

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