Draft: show the error message of the ToDo class in the terminal

The error is both sent to the log file and to the console
instead of only the log.

This is helpful to troubleshoot problems with the delayed
execution of commands, such as when testing a relatively
broken version like d7a9f2e.

src/Mod/Draft/draftutils/todo.py

@@ -40,7 +40,7 @@
 
 import FreeCAD
 import FreeCADGui
-from draftutils.messages import _msg, _wrn, _log
+from draftutils.messages import _msg, _wrn, _err, _log
 
 __title__ = "FreeCAD Draft Workbench, Todo class"
 __author__ = "Yorik van Havre <yorik@uncreated.net>"
@@ -136,6 +136,7 @@ def doTasks():
                         f()
                 except Exception:
                     _log(traceback.format_exc())
+                    _err(traceback.format_exc())
                     wrn = ("ToDo.doTasks, Unexpected error:\n"
                            "{0}\n"
                            "in {1}({2})".format(sys.exc_info()[0], f, arg))
@@ -164,6 +165,7 @@ def doTasks():
                     FreeCAD.ActiveDocument.commitTransaction()
                 except Exception:
                     _log(traceback.format_exc())
+                    _err(traceback.format_exc())
                     wrn = ("ToDo.doTasks, Unexpected error:\n"
                            "{0}\n"
                            "in {1}".format(sys.exc_info()[0], func))
@@ -184,6 +186,7 @@ def doTasks():
                     f()
             except Exception:
                 _log(traceback.format_exc())
+                _err(traceback.format_exc())
                 wrn = ("ToDo.doTasks, Unexpected error:\n"
                        "{0}\n"
                        "in {1}({2})".format(sys.exc_info()[0], f, arg))