Fix error reporting.

theano/sandbox/cuda/basic_ops.py

@@ -2987,6 +2987,11 @@ class GpuJoin(tensor.Join, GpuOp):
                 shape_%(cdna)s[i] = CudaNdarray_HOST_DIMS(%(cdna)s)[i];
                 if((i!=axis) && (shape_%(cdna)s[i]!=shape_out[i]))
                 {
+                    PyErr_Format(
+                        PyExc_ValueError,
+                        "GpuJoin: Wrong inputs for input %%d related"
+                        " to inputs 0.!",
+                        i);
                     %(fail)s;
                 }
             }

theano/tensor/tests/test_basic.py

@@ -4307,7 +4307,7 @@ class T_Join_and_Split(unittest.TestCase):
 
     def test_broadcastable_flags_many_dims_and_inputs(self):
         """
-        Test that the right broadcastable flags get set for a  join
+        Test that the right broadcastable flags get set for a join
         with many inputs and many input dimensions.
         """
         a = TensorType(dtype=self.floatX, broadcastable=[1, 0, 1, 0, 0, 0])()