Fix completion handlers not being called

[joeljfischer]

Fixes #2044

Risk

This PR makes minor API changes.

Testing Plan

• I have verified that I have not introduced new warnings in this PR (or explain why below)
• I have run the unit tests with this PR
• I have tested this PR against Core and verified behavior (if applicable, if not applicable, explain why below).

Unit Tests

None

Core Tests

Basic connection test with Manticore

Core version / branch / commit hash / module tested against: Manticore (Core v7.1.0)
HMI name / version / branch / commit hash / module tested against: Manticore (Generic HMI v0.10.0)

Summary

This PR fixes warnings from Xcode 13 about code paths that don't result in the completion handler being called

Changelog

Bug Fixes

• Fixed code paths that resulted in a completion handler never being called

Tasks Remaining:

None

CLA

• I have signed the CLA

[codecov]

Codecov Report

Merging #2045 (68547aa) into develop (095d0a2) will increase coverage by 71.86%.
The diff coverage is 20.58%.

❗ Current head 68547aa differs from pull request most recent head d888ebe. Consider uploading reports for the commit d888ebe to get more accurate results

@@             Coverage Diff              @@
##           develop    #2045       +/-   ##
============================================
+ Coverage    13.99%   85.85%   +71.86%     
============================================
  Files          447      447               
  Lines        23237    23291       +54     
============================================
+ Hits          3252    19997    +16745     
+ Misses       19985     3294    -16691     

[FrankElias77]

Additional changes needed in the example apps