No way to stop an OPDS catalog search and start a new one

[syskill]

... short of closing the application completely.

How to reproduce:

• Search for something in Feedbooks' public domain catalog
• Download the thing you were looking for
• Tap the magnifying glass to try to search for something else
• Nothing happens
• Watch as the spinner mocks you
• Forcibly close the app, start it again, and do the second search