Zim 0.45 Error creating new page

[Federico Stafforini]

Create a new page via Select File > New Page or ctrl+N
Type some name. Error dialog:

> 'NoneType' object has no attribute 'set_path'

[Federico Stafforini (fstafforini)]

In windows, the follow dump appears in the command prompt window:

ERROR: 'NoneType' object has no attribute 'set_path'
Traceback (most recent call last):
  File "C:\Program Files\zim\zim\gui\widgets.py", line 851, in do_response
    self.destroyed = self.do_response_ok()
  File "C:\Program Files\zim\zim\gui\__init__.py", line 1998, in do_response_ok
    tree = template.process_to_parsetree(self.ui.notebook, page)
  File "C:\Program Files\zim\zim\templates.py", line 299, in process_to_parsetree
    lines = self.process(notebook, page)
  File "C:\Program Files\zim\zim\templates.py", line 287, in process
    self.linker.set_path(page) # this is later reset in body() but we need it here for fir
st part of the template
AttributeError: 'NoneType' object has no attribute 'set_path'