revert 187603d6 sa this break tests and cause…

theano/tensor/basic.py

@@ -2650,8 +2650,6 @@ def ones_like(model, dtype=None):
     """equivalent of numpy.ones_like"""
     if dtype is None:
         dtype = model.type.dtype
-    if model.ndim == 0 and isinstance(model.type, TensorType):
-        return constant(1.0, dtype=dtype)
     ret = fill(model, constant(1.0, dtype=dtype))
     return ret
 
@@ -2661,8 +2659,6 @@ def zeros_like(model, dtype=None):
     """equivalent of numpy.zeros_like"""
     if dtype is None:
         dtype = model.type.dtype
-    if model.ndim == 0 and isinstance(model.type, TensorType):
-        return constant(0.0, dtype=dtype)
     return fill(model, constant(0.0, dtype=dtype))