Editor is initialised twice when navigating clicking "New issue" and there's no template choice

[Dumluregn]

📝 Provide detailed reproduction steps (if any)

1. Get the dev version of Writer.
2. Go to the issues tab in repo without issue types, e.g. https://github.com/ckeditor/ckeditor5-mermaid/issues.
3. Click "New issue".
4. Examine the console.

✔️ Expected result

Only one editor should be created.

❌ Actual result

There are two instances created.

❓ Possible solution

Even though the issues/new/choose page is not defined and never visible, GH still walks through it and Writer finds there an element to Writify. Then navigation takes us automatically to issues/new and another instance is created. Unfortunately the first one is never destroyed (same case as #416).

📃 Other details

• Browser: …
• OS: …

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