[oozie] Some links of a Fork can point to deleted nodes

[08/Sep/2015 10:50:23 -0700] middleware INFO Processing exception: u'cdf597fc-6ef1-bb5e-54e9-65aa426814a8': Traceback (most recent call last):
File "/opt/cloudera/parcels/CDH-5.4.2-1.cdh5.4.2.p0.2/lib/hue/build/env/lib/python2.6/site-packages/Django-1.6.10-py2.6.egg/django/core/handlers/base.py", line 112, in get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/opt/cloudera/parcels/CDH-5.4.2-1.cdh5.4.2.p0.2/lib/hue/build/env/lib/python2.6/site-packages/Django-1.6.10-py2.6.egg/django/db/transaction.py", line 371, in inner
return func(*args, **kwargs)
File "/opt/cloudera/parcels/CDH-5.4.2-1.cdh5.4.2.p0.2/lib/hue/apps/oozie/src/oozie/decorators.py", line 60, in decorate
return view_func(request, *args, **kwargs)
File "/opt/cloudera/parcels/CDH-5.4.2-1.cdh5.4.2.p0.2/lib/hue/apps/oozie/src/oozie/views/editor2.py", line 555, in submit_coordinator
job_id = _submit_coordinator(request, coordinator, mapping)
File "/opt/cloudera/parcels/CDH-5.4.2-1.cdh5.4.2.p0.2/lib/hue/apps/oozie/src/oozie/views/editor2.py", line 577, in _submit_coordinator
wf_dir = Submission(request.user, Workflow(document=wf_doc), request.fs, request.jt, mapping).deploy()
File "/opt/cloudera/parcels/CDH-5.4.2-1.cdh5.4.2.p0.2/lib/hue/desktop/libs/liboozie/src/liboozie/submission2.py", line 166, in deploy
oozie_xml = self.job.to_xml(self.properties)
File "/opt/cloudera/parcels/CDH-5.4.2-1.cdh5.4.2.p0.2/lib/hue/apps/oozie/src/oozie/models2.py", line 188, in to_xml
'workflow_mapping': workflow_mapping
File "/opt/cloudera/parcels/CDH-5.4.2-1.cdh5.4.2.p0.2/lib/hue/desktop/core/src/desktop/lib/django_mako.py", line 114, in render_to_string_normal
result = template.render(**data_dict)
File "/opt/cloudera/parcels/CDH-5.4.2-1.cdh5.4.2.p0.2/lib/hue/build/env/lib/python2.6/site-packages/Mako-0.8.1-py2.6.egg/mako/template.py", line 443, in render
return runtime.render(self, self.callable, args, data)
File "/opt/cloudera/parcels/CDH-5.4.2-1.cdh5.4.2.p0.2/lib/hue/build/env/lib/python2.6/site-packages/Mako-0.8.1-py2.6.egg/mako/runtime.py", line 786, in _render
**kwargs_for_callable(callable, data))
File "/opt/cloudera/parcels/CDH-5.4.2-1.cdh5.4.2.p0.2/lib/hue/build/env/lib/python2.6/site-packages/Mako-0.8.1-py2.6.egg/mako/runtime.py", line 818, in _render_context
_exec_template(inherit, lclcontext, args=args, kwargs=kwargs)
File "/opt/cloudera/parcels/CDH-5.4.2-1.cdh5.4.2.p0.2/lib/hue/build/env/lib/python2.6/site-packages/Mako-0.8.1-py2.6.egg/mako/runtime.py", line 844, in _exec_template
callable_(context, *args, **kwargs)
File "/tmp/tmp5PpCtK/oozie/editor2/gen/workflow.xml.mako.py", line 110, in render_body
__M_writer( node.to_xml(mapping, node_mapping, workflow_mapping) )
File "/opt/cloudera/parcels/CDH-5.4.2-1.cdh5.4.2.p0.2/lib/hue/apps/oozie/src/oozie/models2.py", line 317, in to_xml
return django_mako.render_to_string(self.get_template_name(), data)
File "/opt/cloudera/parcels/CDH-5.4.2-1.cdh5.4.2.p0.2/lib/hue/desktop/core/src/desktop/lib/django_mako.py", line 114, in render_to_string_normal
result = template.render(**data_dict)
File "/opt/cloudera/parcels/CDH-5.4.2-1.cdh5.4.2.p0.2/lib/hue/build/env/lib/python2.6/site-packages/Mako-0.8.1-py2.6.egg/mako/template.py", line 443, in render
return runtime.render(self, self.callable, args, data)
File "/opt/cloudera/parcels/CDH-5.4.2-1.cdh5.4.2.p0.2/lib/hue/build/env/lib/python2.6/site-packages/Mako-0.8.1-py2.6.egg/mako/runtime.py", line 786, in _render
**kwargs_for_callable(callable, data))
File "/opt/cloudera/parcels/CDH-5.4.2-1.cdh5.4.2.p0.2/lib/hue/build/env/lib/python2.6/site-packages/Mako-0.8.1-py2.6.egg/mako/runtime.py", line 818, in _render_context
_exec_template(inherit, lclcontext, args=args, kwargs=kwargs)
File "/opt/cloudera/parcels/CDH-5.4.2-1.cdh5.4.2.p0.2/lib/hue/build/env/lib/python2.6/site-packages/Mako-0.8.1-py2.6.egg/mako/runtime.py", line 844, in _exec_template
callable_(context, *args, **kwargs)
File "/tmp/tmp5PpCtK/oozie/editor2/gen/workflow-fork.xml.mako.py", line 35, in render_body
__M_writer(escape(unicode( node_mapping[child['to']].name )))
KeyError: u'cdf597fc-6ef1-bb5e-54e9-65aa426814a8'