OCM-5247 | fix: error message for unmanaged policies

[chenz4027]

https://issues.redhat.com/browse/OCM-5247

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 23.48%. Comparing base (59e94e8) to head (4ff4c42).
Report is 9 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1963      +/-   ##
==========================================
+ Coverage   23.22%   23.48%   +0.26%     
==========================================
  Files         136      137       +1     
  Lines       21160    22051     +891     
==========================================
+ Hits         4914     5179     +265     
- Misses      15879    16464     +585     
- Partials      367      408      +41     

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[ciaranRoche]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chenz4027, ciaranRoche

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[openshift-ci]

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