Do not advance to next cell if an edit operation failed

[sylvieg]

I am entering a new model and I am not very familiar with the interface so I press enter twice sometimes, wanting to get to the next cell. This seems to be a mistake as I get a message error. When I click to continue, it does, but eventually it cannot go on, especially when it is time to save, and I have to quit without saving and the ewe closes

[jeroens]

EwE should not move the focus to a next cell if an edit operation failed. This is a simple tweak that can be made. We need more info to assess the crash.