fix bug: Reshape attr:shape may come from Gather by a scalar indices

x2paddle/op_mapper/onnx2paddle/opset9/opset.py

@@ -814,6 +814,8 @@ class OpSet9():
                 inputs=val_shape,
                 output=val_shape_cast,
                 param_attr={'dtype': string('int32')})
+            # shape may be [], come form Gather by scalar indices
+            if len(val_shape.out_shapes[0]) > 0:
                 node.fluid_code.add_layer(
                     'reshape',
                     inputs=val_shape_cast,
@@ -826,6 +828,8 @@ class OpSet9():
                 output=node,
                 param_attr=attr)
         else:
+            # shape may be [], come form Gather by scalar indices
+            if len(val_shape.out_shapes[0]) > 0:
                 node.fluid_code.add_layer(
                     'reshape',
                     inputs=val_shape,