Views contributed to containers that don't exist don't error

[sbatten]

Testing #48407

When an extension authors a new view and adds it to a non-existent view container, no error is logged. Instead they are just added to the Explorer view container.

[sandy081]

Following warning will be shown in such cases

View container 'id' does not exist and all views registered to it will be added to 'Explorer'.

Edit: Warning is shown in console as it is meant for extension authors

[mjbvz]

I still see this behavior in 6d7bb1a

For the contributions:

"contributes": {
    "views": {
      "nonesuch": [
        {
          "id": "myview",
          "name": "My View"
        }
      ]
    }
  },

no error and the view is added to the explorer:

[sandy081]

@mjbvz Warning is shown in the console as it is meant for extension authors.