test_play_services: fail gracefully on future error (ros2#798)

Signed-off-by: Louise Poubel <[email protected]>

Author: chapulina

rosbag2_transport/test/rosbag2_transport/test_play_services.cpp

@@ -99,7 +99,9 @@ class PlaySrvsTest : public RosBag2PlayTestFixture
   {
     auto future = cli->async_send_request(request);
     EXPECT_EQ(future.wait_for(service_call_timeout_), std::future_status::ready);
-    auto result = future.get();
+    EXPECT_TRUE(future.valid());
+    auto result = std::make_shared<typename Srv::Response>();
+    EXPECT_NO_THROW({result = future.get();});
     EXPECT_TRUE(result);
     return result;
   }