Description of problem:

The GUI in chart view is broken and it crashes with:-

331291: ERROR: grampsapp.py: line 114: Unhandled exception
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/gramps/plugins/view/pedigreeview.py", line 1941, in cb_update_layout
    self._config.set(constant, entry)
  File "/usr/lib/python2.7/site-packages/gramps/gen/utils/configmanager.py", line 543, in set
    self.emit(key)
  File "/usr/lib/python2.7/site-packages/gramps/gen/utils/configmanager.py", line 507, in emit
    for (cbid, func) in self.callbacks[section][setting]:
TypeError: Couldn't find conversion for foreign struct 'cairo.Context'

This was after importing an existing .ged into a new tree.

Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1. Import .ged into a newly ceated tree
2. Attempt to use the chart view
3. GUI is scrambled and further actions eventually cause crash similar to above related to TypeError: Couldn't find conversion for foreign struct 'cairo.Context'


Reproducible: 

Steps to Reproduce: