[Gauge Plugin] Fix Missing Object handling

[jvigliotta]

Closes #7908

Describe your changes:

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

All Submissions:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Is this a notable change that will require a special callout in the release notes? For example, will this break compatibility with existing APIs or projects that consume these plugins?

Author Checklist

• Changes address original issue?
• Tests included and/or updated with changes?
• Has this been smoke tested?
• Have you associated this PR with a type: label? Note: this is not necessarily the same as the original issue.
• Have you associated a milestone with this PR? Note: leave blank if unsure.
• Testing instructions included in associated issue OR is this a dependency/testcase change?

Reviewer Checklist

• Changes appear to address issue?
• Reviewer has tested changes by following the provided instructions?
• Changes appear not to be breaking changes?
• Appropriate automated tests included?
• Code style and in-line documentation are appropriate?

[codecov]

Codecov Report

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

Project coverage is 57.13%. Comparing base (ea9947c) to head (2ef6354).

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%   57.13%   -0.53%     
==========================================
  Files         677      677              
  Lines       27373    27375       +2     
  Branches     2689     2690       +1     
==========================================
- Hits        15784    15641     -143     
- Misses      11250    11393     +143     
- Partials      339      341       +2     

Flag	Coverage Δ
e2e-ci	62.48% <ø> (+<0.01%)	⬆️
e2e-full	23.46% <ø> (-34.68%)	⬇️
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 15 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!