[per-OS Packages] omitempty for version in expanded Package json representation

[savil]

Summary

Discussing with @Lagoja, we felt that we can omit the version string if its empty

How was it tested?

devbox add github:F1bonacc1/process-compose --exclude-platform x86_64-darwin:

BEFORE:

{
  "packages": {
    "github:F1bonacc1/process-compose/v0.40.2": {
      "version": "",
      "excluded_platforms": [
        "x86_64-darwin"
      ]
    }
  },
  ...
}

AFTER:

{
  "packages": {
    "github:F1bonacc1/process-compose/v0.40.2": {
      "excluded_platforms": [
        "x86_64-darwin"
      ]
    }
  },
  ...
}

[savil]

Current dependencies on/for this PR:

• main
  • PR [per-OS Packages] omitempty for version in expanded Package json representation #1440 👈

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