AttributeError when using outline and split code

[jnsebgosselin]

Description of your problem

What steps will reproduce the problem?

1. Open Spyder
2. Split the Editor through the cog menu [X2 times]
3. Close the last panel created
4. Click on the outline editor

Traceback :
Traceback (most recent call last):
File "C:\Users\jsgosselin\spyder\spyder\plugins\editor.py", line 552, in
editorwindow=self))
File "C:\Users\jsgosselin\spyder\spyder\plugins\editor.py", line 1923, in load
focus=focus)
File "C:\Users\jsgosselin\spyder\spyder\plugins\editor.py", line 1506, in set_current_filename
return editorstack.set_current_filename(filename, focus)
AttributeError: 'NoneType' object has no attribute 'set_current_filename'
Traceback (most recent call last):
File "C:\Users\jsgosselin\spyder\spyder\widgets\editortools.py", line 492, in clicked

File "C:\Users\jsgosselin\spyder\spyder\widgets\editortools.py", line 477, in activated
parent = self.current_editor.parent()
AttributeError: 'NoneType' object has no attribute 'parent'

Versions and main components

• Spyder Version: branch 3.x and master
• Python Version: 3.6.1
• Qt Version: 5.9.1
• PyQt Version: 5.9
• Operating system: Windows 7 64 bits

Dependencies

IPython >=4.0 : 6.1.0 (OK)
cython >=0.21 : 0.25.2 (OK)
jedi >=0.9.0 : 0.10.2 (OK)
nbconvert >=4.0 : 5.2.1 (OK)
numpy >=1.7 : 1.13.0 (OK)
pandas >=0.13.1 : 0.20.3 (OK)
pycodestyle >=2.3: 2.3.1 (OK)
pyflakes >=0.6.0 : 1.5.0 (OK)
pygments >=2.0 : 2.2.0 (OK)
pylint >=0.25 : 1.7.1 (OK)
qtconsole >=4.2.0: 4.4.0.dev (OK)
rope >=0.9.4 : 0.9.4-1 (OK)
sphinx >=0.6.6 : 1.6.2 (OK)
sympy >=0.7.3 : None (NOK)