am 6c74ffbc: am e1d2fb17: Fix playback of email attachments (http://b/issue?id=3066732), don\'t forget to close the cursor, and don\'t crash when somebody launches AudioPreview without a URI.

Merge commit '6c74ffbc0bb58363b45cc9dbc3eff8223f9a6521'

* commit '6c74ffbc0bb58363b45cc9dbc3eff8223f9a6521':
  Fix playback of email attachments (http://b/issue?id=3066732), don't forget