Add each constraint to the list when we get them

Author: ronocod

core/src/main/java/novoda/lib/sqliteprovider/util/DBUtils.java

@@ -156,6 +156,7 @@ public static List<Constraint> getUniqueConstraints(SQLiteDatabase db, String ta
                     columns.add(columnName);
                 }
                 columnCursor.close();
+                constraints.add(new Constraint(columns));
             }
         }
         indexCursor.close();