Error when trying to go to cursor position in Outline

[ok97465]

Description

What steps will reproduce the problem?

1. new python file.
2. click "go to line" button of Outline

Traceback

  File "/home/ok97465/python/spyder/spyder/plugins/outlineexplorer/widgets.py", line 257, in go_to_cursor_position
    item = item_at_line(root_item, line)
  File "/home/ok97465/python/spyder/spyder/plugins/outlineexplorer/widgets.py", line 142, in item_at_line
    return item
UnboundLocalError: local variable 'item' referenced before assignment

Versions

• Spyder version: 4.0.0.dev0 942f6a9
• Python version: 3.6.7
• Qt version: 5.9.4
• PyQt5 version: 5.9.2
• Operating System: Linux 4.20.0-1-MANJARO

Dependencies

pygments >=2.0    :  2.2.0 (OK)
qdarkstyle >=2.6.4:  2.6.4 (OK)
sphinx >=0.6.6    :  1.7.4 (OK)
psutil >=0.3      :  5.4.5 (OK)
pyls >=0.19.0     :  0.19.0 (OK)
nbconvert >=4.0   :  5.3.1 (OK)
pandas >=0.13.1   :  0.23.0 (OK)
numpy >=1.7       :  1.14.3 (OK)
sympy >=0.7.3     :  1.1.1 (OK)
cython >=0.21     :  0.28.2 (OK)
qtconsole >=4.2.0 :  4.3.1 (OK)
IPython >=4.0     :  6.4.0 (OK)
matplotlib >=2.0.0:  3.0.2 (OK)
pylint >=0.25     :  1.8.4 (OK)