In the admin interface, users shouldn't be allowed to save a partner with the Proxy or Library Bundle access method which has no target_url set.
In Django, these validations are defined in a model's clean function. For Partner objects, that can be found in models.py at https://github.com/WikipediaLibrary/TWLight/blob/master/TWLight/resources/models.py#L396.
To solve this task, add a new if statement to this function which, if the object has the PROXY or BUNDLE access methods, verifies that it also has target_url data. If it doesn't, a ValidationError should be raised stating "Proxy and Bundle partners require a target URL".
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