Issue Type: Bug
Repro
- Run the
Python: Create new blank Juypter notebook command
Bug
A blank editor shows up. It never is filled in:

The developer tools for the webview show:
Uncaught Error: An instance of the VS Code API has already been acquired
at <anonymous>:11:13
at e.acquireApi (commons.initial.bundle.js:2)
at e.addHandler (commons.initial.bundle.js:2)
at Object.k (commons.initial.bundle.js:2)
at Module.U4QP (nativeEditor.js:1)
at o (nativeEditor.js:1)
at Object.0 (nativeEditor.js:1)
at o (nativeEditor.js:1)
at a (nativeEditor.js:1)
at nativeEditor.js:1
Extension version: 2020.9.114305
VS Code version: Code - Insiders 1.51.0-insider (16f4a29aa0ac05d3cba222b1f347b7404626c680, 2020-10-26T05:32:45.135Z)
OS version: Darwin x64 19.6.0
Issue Type: Bug
Repro
Python: Create new blank Juypter notebookcommandBug
A blank editor shows up. It never is filled in:
The developer tools for the webview show:
Extension version: 2020.9.114305
VS Code version: Code - Insiders 1.51.0-insider (16f4a29aa0ac05d3cba222b1f347b7404626c680, 2020-10-26T05:32:45.135Z)
OS version: Darwin x64 19.6.0