UnboundLocalError when trying to add a new slice for the first time.

[rfilmyer]

Make sure these boxes are checked before submitting your issue - thank you!

• I have checked the superset logs for python stacktraces and included it here as text if any
• I have reproduced the issue with at least the latest released version of superset (at least the newest version from pip)
• I have checked the issue tracker for the same issue and I haven't found one similar

Superset version

0.14.1

Expected results

I should see a page where I can add new slices.

Actual results

A 500 error and this stacktrace:

2016-12-07 15:30:30,701:ERROR:superset:Exception on /slicemodelview/add [GET]
Traceback (most recent call last):
  File "/Users/roger/projects/superset/lib/python3.5/site-packages/flask/app.py", line 1988, in wsgi_app
    response = self.full_dispatch_request()
  File "/Users/roger/projects/superset/lib/python3.5/site-packages/flask/app.py", line 1641, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/Users/roger/projects/superset/lib/python3.5/site-packages/flask/app.py", line 1544, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/Users/roger/projects/superset/lib/python3.5/site-packages/flask/_compat.py", line 33, in reraise
    raise value
  File "/Users/roger/projects/superset/lib/python3.5/site-packages/flask/app.py", line 1639, in full_dispatch_request
    rv = self.dispatch_request()
  File "/Users/roger/projects/superset/lib/python3.5/site-packages/flask/app.py", line 1625, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/Users/roger/projects/superset/lib/python3.5/site-packages/flask_appbuilder/security/decorators.py", line 26, in wraps
    return f(self, *args, **kwargs)
  File "/Users/roger/projects/superset/lib/python3.5/site-packages/superset/views.py", line 858, in add
    redirect_url = "/r/msg/?url={}&msg={}".format(url, msg)

which points to this line of code.

Steps to reproduce

• Go to the "slices" tab.
• Click the + (Add a new record) button
• 500 error.

I have basically just installed superset from scratch. I only have one database, a Redshift (via postgres/psycopg2) database where I can see tables and columns in the SQL lab.

[xrmx]

Indeed, code looks broken, thanks for reporting.

[bkyryliuk]

hm, broken on master :(

[pgp44]

Is there a workaround for this?

Tx

Peter

[xrmx]

Dup of #2564, will be fixed by #2565