Merge branch '638-illegalstateexception-when-navigating-out-of-combined-feed-and-back-in' into 'master'

Allow Blog Controller listener to re-attach

Closes #638

See merge request !304

briar-android/src/org/briarproject/android/blogs/BaseControllerImpl.java

@@ -85,8 +85,6 @@ abstract class BaseControllerImpl extends DbControllerImpl
 
 	@Override
 	public void setOnBlogPostAddedListener(OnBlogPostAddedListener listener) {
-		if (this.listener != null)
-			throw new IllegalStateException("Listener was already set");
 		this.listener = listener;
 	}