[FIX] local variable 'ctx' referenced before assignment
[FIX] local variable 'ctx' referenced before assignment

Fixes the following:
```Traceback (most recent call last):
  File "/opt/odoo-10.0/addons/report/controllers/main.py", line 100, in report_download
    response = self.report_routes(reportname, converter='pdf', **dict(data))
  File "/opt/odoo-10.0/src/odoo-10.0/odoo/http.py", line 504, in response_wrap
    response = f(*args, **kw)
  File "/opt/odoo-10.0/src/odoo-10.0/addons/report/controllers/main.py", line 45, in report_routes
    pdf = report_obj.with_context(context).get_pdf(docids, reportname, data=data)
  File "/opt/odoo-10.0/src/oca/mis_builder/report/mis_report_instance_qweb.py", line 23, in get_pdf
    return super(Report, self.with_context(ctx)).get_pdf(
UnboundLocalError: local variable 'ctx' referenced before assignment
```
luc-demeyer/account-financial-reporting