Safe check Metadata existence, change to slicevar

[aattuluri]

Checklist

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Description

What does this change do and why?

[Link to related ISSUE]

Thank you!

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.

Project coverage is 63.72%. Comparing base (98cd9e3) to head (5403e50).

Files with missing lines	Patch %	Lines
admiral/cmd/admiral/cmd/root.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #356   +/-   ##
=======================================
  Coverage   63.72%   63.72%           
=======================================
  Files          91       91           
  Lines       11922    11922           
=======================================
  Hits         7597     7597           
  Misses       3911     3911           
  Partials      414      414           

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