Sadly, no, there's nothing in ReSharper to help with this, mainly because without something like Java's checked exceptions, there's no reliable way of knowing what exceptions could be thrown by code, especially due to runtime conditions.
As for plugins, it looks like Agent Johnson hasn't been updated since 7.1. There's another plugin called Exceptional that might be useful. It's 8.0 only, but it's worth adding an issue on the codeplex site, see if the owner could update.
And since it's open source, you could try and update it yourself - remove the 8.0 SDK imports in the csproj, add a reference to the 8.1 SDK nuget and rebuild. There will be a number of compile errors due to changing APIs, but they should hopefully be not too tricky to sort out.