fix error when project yaml file has no deprecation #117
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When project yaml file has no deprecations, upon starting it with tmuxinator, an error is thrown.
![by default 2013-07-25 at 8 56 17 am](https://camo.githubusercontent.com/5fc3dd08031bcb30981f501519cd0e48955421630b1fbe6b20461c814ce42909/68747470733a2f2f662e636c6f75642e6769746875622e636f6d2f6173736574732f34333434372f3835333136352f61363563356333302d663463652d313165322d396565302d3066373831643936633666342e706e67)