L2SS-554: Fix exception

tangostationcontrol/tangostationcontrol/beam/delays.py

@@ -61,7 +61,7 @@ class delay_calculator:
     def convert(self, direction, antenna_itrf: list([float])):
         # explicitly check validity to get a proper error message
         if not self.is_valid_direction(direction):
-            raise ValueError(f"Could not convert direction {direction} into a pointing") from e
+            raise ValueError(f"Invalid direction: {direction}")
 
         # obtain the direction vector for a specific pointing
         pointing = self.measure.direction(*direction)