Enhance error message when x or y is empty in elementwise_op

[zhiqiu]

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Enhance error message when x or y is empty in elementwise_op

import paddle
import numpy as np
paddle.set_device('cpu')

weight_arr = np.array([], dtype=np.float32)
weight = paddle.to_tensor(np.reshape(weight_arr, (1, 8, 0)))

x_arr = np.array([], dtype=np.float32)
x = paddle.to_tensor(np.reshape(x_arr, (0, 0, 0)))

y_arr = np.array([], dtype=np.float32)
y = paddle.to_tensor(np.reshape(y_arr, (0, 0, 0)))

bce_loss = paddle.nn.BCELoss(weight, 'none')
bce_loss(x, y)

# ValueError: (InvalidArgument) The input X should not be empty

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