fix: set parent nodes correctly for virtual files

[armano2]

This PR fixes crashes and issues related to undefined parent node.

TypeError: Cannot read property 'kind' of undefined
      at Object.canContainDirective (src/node-utils.ts:5672:33)
      at convertBodyExpressionsToDirectives (src/convert.ts:18875:155)
      at convert (src/convert.ts:19401:13)
      at converter (src/convert.ts:18818:16)
      at convertChild (src/convert.ts:18835:16)
      at convert (src/convert.ts:19627:80)
      at converter (src/convert.ts:18818:16)
      at convertChild (src/convert.ts:18835:16)
      at node.statements.forEach.statement (src/convert.ts:19373:95)
          at Array.forEach (<anonymous>)

@JamesHenry this is important change, right now it can crash

fixes: #77

[uniqueiniquity]

I didn't initially set that flag due to performance concerns, but if you're finding the "non-existent file" scenario to be particularly important, then I'm fine with it.

[armano2]

@uniqueiniquity we don't need it but we will have to stop using parent, right now in some places it will crash and some ifs are going to fails..

[JamesHenry]

🎉 This PR is included in version 9.0.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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