Fix progress bar showing for self-sends.

For self-sends, we were never marking attachments as uploaded. I made is
so that happens now, but to prevent it for showing for already-sent
messages, we also don't show controls for self-send conversations.

src/org/thoughtcrime/securesms/database/MmsDatabase.java

@@ -67,6 +67,7 @@ import org.thoughtcrime.securesms.util.TextSecurePreferences;
 import org.thoughtcrime.securesms.util.Util;
 import org.whispersystems.libsignal.util.guava.Optional;
 
+import java.io.Closeable;
 import java.io.IOException;
 import java.security.NoSuchAlgorithmException;
 import java.security.SecureRandom;
@@ -1176,7 +1177,7 @@ public class MmsDatabase extends MessagingDatabase {
     }
   }
 
-  public class Reader {
+  public class Reader implements Closeable {
 
     private final Cursor cursor;
 
@@ -1337,8 +1338,11 @@ public class MmsDatabase extends MessagingDatabase {
       }
     }
 
+    @Override
     public void close() {
-      cursor.close();
+      if (cursor != null) {
+        cursor.close();
+      }
     }
   }