Fixes #38128 - allow blank image mode digests #1938

Job	Run time
Angular bastion - NodeJS 18	58s
Angular bastion_katello - NodeJS 18	1m 26s
Rubocop / Rubocop	59s
Ruby / Setup matrix	3s
Ruby / test:katello - Foreman develop with Ruby 2.7 and Node 18 on PostgreSQL 13	25m 56s
Ruby / Existing database - Foreman ${{ inputs.foreman_version }} with Ruby ${{ matrix.ruby }} and Node ${{ matrix.node }} on PostgreSQL ${{ matrix.postgresql }}	0s
Ruby / db:seed - Foreman develop with Ruby 2.7 and Node 18 on PostgreSQL 13	2m 17s
Ruby / plugin:assets:precompile[katello] RAILS_ENV=production DATABASE_URL=nulldb://nohost - Foreman develop with Ruby 2.7 and Node 18 on PostgreSQL 13	7m 32s
Ruby / test:katello - Foreman develop with Ruby 3.0 and Node 18 on PostgreSQL 13	26m 36s
Ruby / db:seed - Foreman develop with Ruby 3.0 and Node 18 on PostgreSQL 13	1m 49s
Ruby / plugin:assets:precompile[katello] RAILS_ENV=production DATABASE_URL=nulldb://nohost - Foreman develop with Ruby 3.0 and Node 18 on PostgreSQL 13	7m 6s
Ruby / Test suite	2s
	1h 14m 44s

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