Add improvements to podcast types. [Change type only when subscribed] #13
Description
The podcast view /#/podcasts/1 has a type drop down that affects the default sort order of the displayed episodes. If the user is subscribed to that podcast the type is save and will be set when the podcast loads.
If the user is not subscribed to that podcast the type defaults to normal, and the changed value will not be confused (type is an attribute of subscription, no subscription means nowhere to save the type).
Users may be confused when the podcast type only saves sometimes. Maybe don't let them change the type unless they are subscribed.