Deploying a notebook with an invalid or uninstalled library will fail silently

[kgartland-rstudio]

When trying to deploy a notebook that imports a library that is not installed locally, publishing is allowed but no real indication that the deploy has failed/stopped.

STR:

1. add an import statement to a library that is not installed locally (I used gensim)
2. publish the content
3. logs will display an ImportErrror but the dialog does not indicate that the deploy has stopped. it's unclear that you have to hit Cancel to exit out of the deploy screen.

Suggestion:
Grey-out the publishing icon until the program is run successfully.