Unique Tool Auto Configuration

[MelGibson]

Currently when a unique tool is used, and a field is removed upstream then the workflow fails to move forward. If you have one or two unique fields being used then it is no big deal, but when you have a very complex workflow then you have to click into each one of those tools in order to update. This can be very problematic and creates a lot of time following all the branches that is connected after the 1st unique tool is used. My suggestion is to make this a warning instead of a fail or have an option to select fail or warning like the union tool is setup. This way people can decide how they want this tool to react when fields are removed.