[Gauge Plugin] Fix Missing Object handling

[jvigliotta]

Closes #7908

Describe your changes:

Don't make requests if there's no metadata.

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Author Checklist

• Changes address original issue?
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Reviewer Checklist

• Changes appear to address issue?
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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 57.43%. Comparing base (ea9947c) to head (3703b84).

Files with missing lines	Patch %	Lines
src/plugins/gauge/components/GaugeComponent.vue	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7923      +/-   ##
==========================================
- Coverage   57.66%   57.43%   -0.23%     
==========================================
  Files         677      677              
  Lines       27373    27375       +2     
  Branches     2689     2690       +1     
==========================================
- Hits        15784    15724      -60     
- Misses      11250    11310      +60     
- Partials      339      341       +2     

Flag	Coverage Δ
e2e-ci	62.48% <ø> (+<0.01%)	⬆️
e2e-full	41.81% <ø> (-16.33%)	⬇️
unit	49.30% <0.00%> (-0.06%)	⬇️

Files with missing lines	Coverage Δ
src/plugins/gauge/components/GaugeComponent.vue	62.35% <0.00%> (-1.85%)	⬇️

... and 10 files with indirect coverage changes

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[davetsay]

Should we use telemetry collection here for gauges?

[jvigliotta]

Should we use telemetry collection here for gauges?

Yes, but not for this one!

[davetsay]

Great work