feat: Better interpretable error message (RK).

source/RobotAPI/components/units/RobotUnit/Devices/GlobalRobotPoseSensorDevice.cpp

@@ -121,10 +121,14 @@ namespace armarx
         const IceUtil::Time& sensorValuesTimestamp,
         const IceUtil::Time& timeSinceLastIteration)
     {
-
-        if (sensorGlobalPositionCorrection == nullptr or sensorRelativePosition == nullptr)
+        if (sensorGlobalPositionCorrection == nullptr)
+        {
+            ARMARX_ERROR << "The global position correction sensor is not available.";
+            return;
+        }
+        if (sensorRelativePosition == nullptr)
         {
-            ARMARX_ERROR << "one of the sensors is not available";
+            ARMARX_ERROR << "The relative position sensor is not available.";
             return;
         }