Scrapbook media types emit warning in notebook executions

[MSeal]

Bug: Notebook Editor, Interactive Window, Editor cells

Steps to cause the bug to occur

1. Install scrapbook pip install nteract-scrapbook
2. Create and execute this cell

import scrapbook as sb
sb.glue("hello", "world")

Actual behavior

Note the warning messages for the unrecognized mime type

"The Mime type unknown is not currently supported."

Expected behavior

Silently skip rendering application/scrapbook.scrap.{encoder}+json as it doesn't need a rendering. And example output would be:

     "data": {
      "application/scrapbook.scrap.json+json": {
       "data": {
        "a": 1,
        "b": 2
       },
       "encoder": "json",
       "name": "some_dict",
       "version": 1
      }

In the future there may be extra prefixes to the mimetypes like application/scrapbook.scrap.{future_prefixes_here}.{encoder}+json

See: nteract/scrapbook#69

Your Jupyter and/or Python environment

Please provide as much info as you readily know

• Jupyter server running: Local / N/A
• Extension version: 2020.1.58038
• VS Code version: 1.41.1
• Setting python.jediEnabled: false
• Python and/or Anaconda version: 3.x.x
• OS: Linux (Ubuntu 18.04) / N/A:
• Virtual environment: N/A

Developer Tools Console Output

Microsoft Data Science for VS Code Engineering Team: @rchiodo, @IanMatthewHuff, @DavidKutu, @DonJayamanne, @greazer

[IanMatthewHuff]

Thanks for the report on this. I can see an issue here as well, though I'm seeing a slightly more concerning error message (might just be our dev build). We'll look into it:

[IanMatthewHuff]

Just for tracking, when I input this it blows the cell away totally:

[greazer]

We can't crash if we run across an unknown mime type.

[IanMatthewHuff]

Validated on most recent VSIX from release CI. Nothing in the output now as it's just skipped.