User gets error feedback if the urth widgets are not configured correctly about declarativewidgets

[wellecks]

Starting to look into this

[parente]

We added an error hook for kernel side errors in the dashboard code. Maybe relevant?

[wellecks]

The ErrorLog? Thanks - this'll be useful

[parente]

That's the one. It's probably already capturing backend widget errors, but we only enable it in dashboard view (inside and outside the notebook) at the moment I think.

[wellecks]

We implemented the error handling so that a message is displayed in the cell's output area after a kernel error occurs - this covers errors for the Function and DataFrame widgets. The Channels widget is not associated with a code cell, so we log those errors to the console.

However, we've seen some odd behavior in the Scala widgets, and need to determine whether it's due to using an old kernel image, a bug on the kernel, or a bug on the widgets.

[wellecks]

I opened separate issues #45 and #46 that address the Scala behavior