Fix buggy parser.

accountant/api/views/parsers.py

@@ -14,7 +14,6 @@
     You should have received a copy of the GNU Affero General Public License
     along with Accountant.  If not, see <http://www.gnu.org/licenses/>.
 """
-from copy import deepcopy
 import dateutil.parser
 
 from flask.ext.restful import reqparse
@@ -53,5 +52,9 @@ account_id_parser.add_argument(
 # Parser for a date range and an account id.
 account_range_parser = range_parser.copy()
 account_range_parser.add_argument(
-    deepcopy(account_id_parser.args[0])
+    'account_id',
+    type=int,
+    required=True,
+    location='args',
+    help='Id of the account'
 )