Fix nullptr error in GamePadUnit

source/RobotAPI/drivers/GamepadUnit/GamepadUnit.cpp

@@ -50,6 +50,11 @@ void GamepadUnit::onConnectComponent()
             return;
         }
         ARMARX_TRACE;
+        if (!dataTimestamp)
+        {
+            ARMARX_INFO << "dataTimestamp is null, waiting for value";
+            return;
+        }
         ARMARX_CHECK_NOT_NULL(dataTimestamp);
         const IceUtil::Time age = IceUtil::Time::now() - dataTimestamp->toTime();
         if (age.toMilliSeconds() < getProperty<int>("PublishTimeout").getValue())