Regression

dariah_topics.preprocessing.create_dictionary (from nosetests)

Failing for the past 1 build (Since #185 )
Took 1 ms.

Error Message

Failed doctest test for dariah_topics.preprocessing.create_dictionary
  File "/mnt/data/jenkins/workspace/DARIAH-Topics/dariah_topics/preprocessing.py", line 590, in create_dictionary

----------------------------------------------------------------------
File "/mnt/data/jenkins/workspace/DARIAH-Topics/dariah_topics/preprocessing.py", line 605, in dariah_topics.preprocessing.create_dictionary
Failed example:
    create_dictionary(['example'])
Exception raised:
    Traceback (most recent call last):
      File "/usr/lib/python3.5/doctest.py", line 1321, in __run
        compileflags, 1), test.globs)
      File "<doctest dariah_topics.preprocessing.create_dictionary[0]>", line 1, in <module>
        create_dictionary(['example'])
      File "/mnt/data/jenkins/workspace/DARIAH-Topics/dariah_topics/preprocessing.py", line 608, in create_dictionary
        if all(isinstance(element, list) for element in list_of_strings):
    UnboundLocalError: local variable 'list_of_strings' referenced before assignment

Stacktrace

Traceback (most recent call last):
  File "/usr/lib/python3.5/unittest/case.py", line 59, in testPartExecutor
    yield
  File "/usr/lib/python3.5/unittest/case.py", line 601, in run
    testMethod()
  File "/usr/lib/python3.5/doctest.py", line 2190, in runTest
    raise self.failureException(self.format_failure(new.getvalue()))
AssertionError: Failed doctest test for dariah_topics.preprocessing.create_dictionary
  File "/mnt/data/jenkins/workspace/DARIAH-Topics/dariah_topics/preprocessing.py", line 590, in create_dictionary

----------------------------------------------------------------------
File "/mnt/data/jenkins/workspace/DARIAH-Topics/dariah_topics/preprocessing.py", line 605, in dariah_topics.preprocessing.create_dictionary
Failed example:
    create_dictionary(['example'])
Exception raised:
    Traceback (most recent call last):
      File "/usr/lib/python3.5/doctest.py", line 1321, in __run
        compileflags, 1), test.globs)
      File "<doctest dariah_topics.preprocessing.create_dictionary[0]>", line 1, in <module>
        create_dictionary(['example'])
      File "/mnt/data/jenkins/workspace/DARIAH-Topics/dariah_topics/preprocessing.py", line 608, in create_dictionary
        if all(isinstance(element, list) for element in list_of_strings):
    UnboundLocalError: local variable 'list_of_strings' referenced before assignment