Bug fix: yarn v1 dependency tree was incomplete

[prabhu]

For the attached yarn v1 lock file, the dependency tree was incomplete in two scenarios:

1. Presence of optional dependencies
2. Use of space in the version range

Components list was unaffected.

Example: nomnom is no longer missed due to the space nomnom ">= 1.5.x"

{
      "ref": "pkg:npm/jsonlint@1.6.2",
      "dependsOn": [
        "pkg:npm/JSV@4.0.2",
        "pkg:npm/nomnom@1.8.1"
      ]
}

[prabhu]

@cerrussell should we update the snapshots for this?