Description of problem:

Processor MarketplacePackageProcessor threw an error while validating the entity package:rhdh/backstage-plugin-techdocs-module-addons-contrib; caused by TypeError: /spec/partOf must be array - type: array entity="package:rhdh/backstage-plugin-techdocs-module-addons-contrib" location="file:marketplace-package-provider" trace_id="f3cb81a40e0f1895880f14eb27e67343" span_id="18db7bdfc1ccde20" trace_flags="01"

Contrib plugin not shown correctly due to invalid contrib package.

Prerequisites (if any, like setup, operators/versions):

Steps to Reproduce

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Actual results:

Expected results:

Reproducibility (Always/Intermittent/Only Once):

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