Fix #7335 Metadata manager: error creating file attribute

[dennishendriksen]

Checklist

• Functionality works & meets specifications
• Code reviewed
• (n.a.) Code unit/integration/system tested
• (n.a.) User documentation updated
• (n.a.) (If you have changed REST API interface) view-swagger.ftl updated
• (n.a.) Test plan template updated
• Clean commits
• Added Feature/Fix to release notes

[codecov]

Codecov Report

Merging #7403 into master will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff            @@
##             master   #7403   +/-   ##
========================================
  Coverage      51.5%   51.5%           
  Complexity     6194    6194           
========================================
  Files          1138    1138           
  Lines         34164   34164           
  Branches       3980    3980           
========================================
  Hits          17596   17596           
  Misses        15046   15046           
  Partials       1522    1522

Flag	Coverage Δ	Complexity Δ
#api	?	?
#integration	8.8% <ø> (ø)	3 <ø> (ø)	⬇️
#unit	51.5% <0%> (ø)	6191 <0> (ø)	⬇️

Impacted Files	Coverage Δ	Complexity Δ
...rc/components/MetadataManagerAttributeEditForm.vue	0% <0%> (ø)	0 <0> (ø)	⬇️

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