arobson/anvil.uglify — pull request #4 by tysoncadenhead (2013-03-21 21:05:38+00:00)
Title: Fixed issue in Node 0.10.1

In the current version of Node, I was getting an error that said:

````
error running activity post-process : TypeError: Arguments to path.join must be strings
TypeError: Arguments to path.join must be strings
````

This will fix the issue I was seeing by wrapping the sourceMapExists as a string. If there is a better way, that works too, but this worked for me.