Fix handling when no matching platform is found

[corneliusweig]

err is nil here, so errors.Wrapf(...) is nil too, and that the calling code assumes that no error happened.

Fix #344

[codecov-io]

Codecov Report

Merging #345 into master will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           master     #345   +/-   ##
=======================================
  Coverage   56.78%   56.78%           
=======================================
  Files          19       19           
  Lines         907      907           
=======================================
  Hits          515      515           
  Misses        339      339           
  Partials       53       53

Impacted Files	Coverage Δ
pkg/installation/install.go	42.42% <0%> (ø)	⬆️

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[ahmetb]

/lgtm
/approve

Up to you to make a patch release or not.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahmetb, corneliusweig

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