Removed -is constant- tests to switch sink optimizations

theano/tensor/opt.py

@@ -1194,12 +1194,12 @@ def local_mul_switch_sink(node):
     for idx , i in enumerate(node.inputs):
         if i.owner and i.owner.op == T.switch:
             switch = i.owner
-            if isinstance(switch.inputs[1],Constant) and get_constant_value(switch.inputs[1]) == 0.:
+            if get_constant_value(switch.inputs[1]) == 0.:
                 listmul = node.inputs[:idx] + node.inputs[idx+1:]
                 fct = [T.switch(switch.inputs[0],0,T.mul(*(listmul + [switch.inputs[2]])))]
                 fct[0].values_eq_approx = fct[0].type.values_eq_approx_remove_nan
                 return fct
-            if isinstance(switch.inputs[2],Constant) and get_constant_value(switch.inputs[2]) == 0.:
+            if get_constant_value(switch.inputs[2]) == 0.:
                 listmul = node.inputs[:idx] + node.inputs[idx+1:]
                 fct = [T.switch(switch.inputs[0],T.mul(*(listmul + [switch.inputs[1]])),0)]
                 fct[0].values_eq_approx = fct[0].type.values_eq_approx_remove_nan