Fix issue with some search results returning empty.

app/src/main/java/org/thoughtcrime/securesms/database/ThreadDatabase.java

@@ -950,7 +950,7 @@ public class ThreadDatabase extends Database {
                              .setRecipient(recipient)
                              .setType(cursor.getInt(cursor.getColumnIndexOrThrow(ThreadDatabase.SNIPPET_TYPE)))
                              .setDistributionType(cursor.getInt(cursor.getColumnIndexOrThrow(ThreadDatabase.TYPE)))
-                             .setBody(cursor.getString(cursor.getColumnIndexOrThrow(ThreadDatabase.SNIPPET)))
+                             .setBody(Util.emptyIfNull(cursor.getString(cursor.getColumnIndexOrThrow(ThreadDatabase.SNIPPET))))
                              .setDate(cursor.getLong(cursor.getColumnIndexOrThrow(ThreadDatabase.DATE)))
                              .setArchived(cursor.getInt(cursor.getColumnIndex(ThreadDatabase.ARCHIVED)) != 0)
                              .setDeliveryStatus(cursor.getInt(cursor.getColumnIndexOrThrow(ThreadDatabase.STATUS)))