Return err if no upgrade init func

[sasurobert]

No description provided.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (41c60e3) 42.16% compared to head (136cc28) 42.16%.

❗ Current head 136cc28 differs from pull request most recent head 9fedfca. Consider uploading reports for the commit 9fedfca to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #784   +/-   ##
=======================================
  Coverage   42.16%   42.16%           
=======================================
  Files          49       49           
  Lines        9200     9200           
=======================================
  Hits         3879     3879           
  Misses       4878     4878           
  Partials      443      443           

Files	Coverage Δ
vmhost/hostCore/execution.go	0.00% <0.00%> (ø)

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