regression: Apps Engine failing to respond apps' api when app returned no headers

[KevLehman]

Proposed changes (including videos or screenshots)

Issue(s)

https://rocketchat.atlassian.net/browse/CTZ-243

Steps to test or reproduce

Further comments

Caused by #36164

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.56%. Comparing base (d6d78d4) to head (98df517).
Report is 1 commits behind head on release-7.8.0.

Additional details and impacted files

@@              Coverage Diff               @@
##           release-7.8.0   #36314   +/-   ##
==============================================
  Coverage          64.56%   64.56%           
==============================================
  Files               3147     3147           
  Lines             104615   104615           
  Branches           19763    19766    +3     
==============================================
+ Hits               67543    67549    +6     
+ Misses             34388    34383    -5     
+ Partials            2684     2683    -1     

Flag	Coverage Δ
unit	69.15% <ø> (+0.01%)	⬆️

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