elliptic curve formal group printing error

[dmharvey]

sage: E = EllipticCurve("37a")

sage: E.formal_group()
---------------------------------------------------------------------------
<type 'exceptions.TypeError'>             Traceback (most recent call last)

[...]
/home/was/sage/local/lib/python2.5/site-packages/sage/schemes/elliptic_curves/formal_group.py in __repr__(self)
     24 
     25     def __repr__(self):
---> 26         return "The formal group associated to the " + self.__E
     27 
     28     def curve(self):

<type 'exceptions.TypeError'>: cannot concatenate 'str' and 'EllipticCurve_rational_field' objects