gistfile1.txt

Traceback (most recent call last):
  File "/home/dbc/projects/grace/venv/lib/python2.7/site-packages/flask/app.py", line 1836, in __call__
    return self.wsgi_app(environ, start_response)
  File "/home/dbc/projects/grace/venv/lib/python2.7/site-packages/werkzeug/contrib/fixers.py", line 144, in __call__
    return self.app(environ, start_response)
  File "/home/dbc/projects/grace/venv/lib/python2.7/site-packages/flask/app.py", line 1820, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "/home/dbc/projects/grace/venv/lib/python2.7/site-packages/flask/app.py", line 1403, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/home/dbc/projects/grace/venv/lib/python2.7/site-packages/flask/app.py", line 1817, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/dbc/projects/grace/venv/lib/python2.7/site-packages/flask/app.py", line 1477, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/dbc/projects/grace/venv/lib/python2.7/site-packages/flask/app.py", line 1381, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/home/dbc/projects/grace/venv/lib/python2.7/site-packages/flask/app.py", line 1475, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/dbc/projects/grace/venv/lib/python2.7/site-packages/flask/app.py", line 1461, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/dbc/projects/grace/venv/lib/python2.7/site-packages/flask/views.py", line 84, in view
    return self.dispatch_request(*args, **kwargs)
  File "/home/dbc/projects/grace/backend/views/resource.py", line 29, in dispatch_request
    return self.add_cors_headers(handler(**kargs))
  File "/home/dbc/projects/grace/backend/models/roles.py", line 13, in wrapper
    return view_function(*args, **kwargs)
  File "/home/dbc/projects/grace/backend/views/invoices.py", line 31, in post
    on_success=render_pdf, initial=cost)
  File "/home/dbc/projects/grace/backend/views/util.py", line 183, in create_one
    entity.fill_from_formdata(initial(flask.request))
  File "/home/dbc/projects/grace/backend/views/invoices.py", line 68, in cost
    invoice_total += calculateCost(job.first())
  File "/home/dbc/projects/grace/backend/views/invoices.py", line 106, in calculateCost
    limit = max(result.lower_limit for result in results)
ValueError: max() arg is an empty sequenc