module error -> warning for docs

rq_hardware/thd_roboct/thd_roboct_service.py

@@ -33,8 +33,9 @@ try:
     from trajectory_toolbox.util.util_poses import Frame, ScanPoseList, ScanPoseTuple  # type: ignore
 
 except ModuleNotFoundError:
-    raise ModuleNotFoundError("Packages are spedific for the RoboCT of the Deggendorf Institute of Technology. \n" + 
-                              "Please Contact: simon.wittl@th-deg.de")
+    import warnings
+    warnings.warn("Packages are spedific for the RoboCT of the Deggendorf Institute of Technology. \n" + 
+                  "Please Contact: simon.wittl@th-deg.de")
 
 
 class TurntablePlannerParameter: