DocumentsUI: Remove catch-all statements

This removes several "catch (Exception)" statements which violates the Android code
style guidelines and hides problems.

I left some catch-all statements in, as they seem to be intended like this (grep for
"catch (Exception").

I suggest we do not merge this before we are sure that we fixed any problems. One problem
is a crash when deleting items (I'm currently working to fix that).

PS 2: Add exception to log.
Change-Id: I483c320c7ee256acd993dd2a509c031fa5e3f09e
base: DocumentUI: fix a few issues handling remote content

http://jira.omnirom.org/browse/OMNI-956
http://jira.omnirom.org/browse/OMNI-950

Change-Id: I8d50d71a9c91486dfc9e5da01538c6b5a626f054
DocumentsUI: catch berserk apps on building recents

We should not crash Documents app because of that

Change-Id: Ie89a10c5005aef7f3e75a4f5a17f018e0fbc0814
DocumentsUI: fix recursive delete

Create one DirectoryLoader in UI thread to use for delete

Change-Id: I83a5811f152090f7812ad58ff4ee3bc13748d158