JsGantt fails with ChildTickets plugin and non-numeric parent value (#%s)

[rzhidalgo@yahoo.com]

Trac JsGantt plugin fails to generate the chart with the following log error message: ---

2012-01-20 17:44:43,257 Trac[formatter] ERROR: Macro TracJSGanttChart(milestone=Milestone1, res=0, format=quarter) failed:
Traceback (most recent call last):
  File "build/bdist.linux-i686/egg/trac/wiki/formatter.py", line 717, in _macro_formatter
    return macro.process(args, in_paragraph=True)
  File "build/bdist.linux-i686/egg/trac/wiki/formatter.py", line 304, in process
    text = self.processor(text)
  File "build/bdist.linux-i686/egg/trac/wiki/formatter.py", line 291, in _macro_processor
    text)
  File "build/bdist.linux-i686/egg/tracjsgantt/tracjsgantt.py", line 612, in expand_macro
    tasks = self._add_tasks(options)
  File "build/bdist.linux-i686/egg/tracjsgantt/tracjsgantt.py", line 565, in _add_tasks
    self.tickets.sort(key=itemgetter('wbs'))
KeyError: 'wbs'

--- The ChildTickets plugin requires a '#' sign before the ticket number as a parent field value, which seems to be causing the problem.