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Improve handling of a missing R environment. #2215
Previously, the error message 'Missing R environment. Please check your specified R installation exists.' would be displayed in an obscure location in the paster log. With this change, galaxy will set the tool dependency to Error and display the error message in the admin panel.
The lack of a displayed error led to @nturaga and I spending an extra 30 minutes tracking down a misconfigured dependency on Tuesday.