Catch PicklingError instead of SyntaxError

Author: rotu

colcon_python_setup_py/package_identification/python_setup_py.py

@@ -137,8 +137,8 @@ def get_setup_arguments(setup_py):
             # filter out any data which doesn't serialize
             for key, value in list(data.items()):
                 try:
-                    pickle.dumps(repr(value))
-                except SyntaxError:
+                    pickle.dumps(value)
+                except pickle.PicklingError:
                     del data[key]
             return data