fix `GetPlatform` function ignoring the `All` field

[umbynos]

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Please check if the PR fulfills these requirements

• [x] The PR has no duplicates (please search among the Pull Requests before creating one)
• [x] The PR follows our contributing guidelines
• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)
• [ ] UPGRADING.md has been updated with a migration guide (for breaking changes)

• What kind of change does this PR introduce?

Bug fix

• What is the current behavior?

#1520

• What is the new behavior?

The all field inside the PlatformListRequest works correctly now

• Does this PR introduce a breaking change, and is titled accordingly?

no

• Other information:

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