Fixed reprs following compas release

Author: beverlylytle

docs/examples/03_backends_ros/files/03_forward_kinematics_urdf.py

@@ -9,4 +9,4 @@
 print("Frame in the world coordinate system")
 print(frame_WCF)
 
-assert str(frame_WCF.point) == 'Point(0.300, 0.100, 0.500)'
+assert repr(frame_WCF.point) == 'Point(0.300, 0.100, 0.500)'

src/compas_fab/backends/ros/messages/direct_ur.py

@@ -10,11 +10,7 @@ def __init__(self, **kwargs):
             setattr(self, k, v)
 
     def __str__(self):
-        result = ""
-        for key, value in self.__dict__.items():
-            if value:
-                result += "%s, " % value
-        return result[:-2]
+        return ", ".join(["{!r}" for value in self.__dict__.values() if value])
 
     def __repr__(self):
         return self.__str__