fix test_py_reader_using_executor error

python/paddle/fluid/tests/unittests/test_py_reader_using_executor.py

@@ -96,7 +96,8 @@ class TestPyReaderUsingExecutor(unittest.TestCase):
         self.queue_capacity = 50
 
     def test(self):
-        for use_cuda in [False, True]:
+        for use_cuda in ([False, True]
+                         if core.core.is_compiled_with_cuda() else [False]):
             for use_parallel_executor in [False, True]:
                 for use_double_buffer in [False, True]:
                     print('Test Parameters:'),