Make conditions more precise

theano/scan_module/scan_opt.py

@@ -729,7 +729,7 @@ class PushOutScanOutput(gof.Optimizer):
                                                    # 1 if sitsot_in_idx==0
                     dot_input = nd.inputs[dot_in_idx]
 
-                    if (isinstance(dot_input.owner, gof.Apply) and
+                    if (dot_input.owner is not None and
                         isinstance(dot_input.owner.op, theano.tensor.Dot) and
                         len(dot_input.clients) == 1 and
                         dot_input.owner.inputs[0].ndim == 2 and
@@ -797,7 +797,7 @@ class PushOutScanOutput(gof.Optimizer):
 
             client = outer_var.clients[0][0]
 
-            if (isinstance(client, gof.Apply) and
+            if (client != 'output' and
                 isinstance(client.op, theano.tensor.Subtensor) and
                 isinstance(client.inputs[1], theano.Constant) and
                 client.inputs[1].ndim == 0 and