astropy/astropy — pull request #3220 by adonath (2014-12-17 15:22:29+00:00)
Title: Fixed #2274

This PR is a quick fix for #2274. I use the `custom_model` function to create an `astropy.modeling.Model` instance internally, when the model is a an ordinary function. Furthermore I added a check, that the `model` argument is callable.