Error handling

[ben-said]

Currently, when I upload a new template to the Config store, if the template is invalid, the system fails silently. It would be very useful to have a message that indicates what the problem might be, e.g. incorrect schema, invalid data types, etc.

[ben-said]

When uploading config, on config editor, I would like the uploader to populate the fields that it can, and provide error messaging for the fields that are either in an incorrect format, or missing.