UnicodeEncodeError: 'ascii' codec can't encode character u'\xe4' in position 9: ordinal not in range(128)

[deiferni]

In

opengever.core/opengever/ogds/base/sources.py

Line 882 in fff3e1f

'{}{}'.format(self.GROUP_PREFIX, obj.id()),

we use Group.id as term token. The id can contain non-ascii characters, so we should handle this when creating tokens.

Steps to reproduce:

• have groups with non-ascii characters in DN, e.g. with an umlaut, make sure they are in ogds
• go to Dossier -> Schützen
• Select one of the fields, e.g. Lesend
• when you search for the group with an umlaut the following error will be created

https://sentry.4teamwork.ch/sentry/onegov-gever/issues/4503/

UnicodeEncodeError: 'ascii' codec can't encode character u'\xe4' in position 9: ordinal not in range(128)
(2 additional frame(s) were not displayed)
...
  File "ZPublisher/Publish.py", line 48, in call_object
    result=apply(object,args) # Type s<cr> to step into published object.
  File "apps/eggs/ftw.keywordwidget-1.5.2-py2.7.egg/ftw/keywordwidget/search.py", line 26, in __call__
    batch = Batch.fromPagenumber(items=source.search(query),
  File "apps/eggs/opengever.core-2019.3.4-py2.7.egg/opengever/ogds/base/sources.py", line 124, in search
    self.terms.extend(source.search(query_string))
  File "apps/eggs/opengever.core-2019.3.4-py2.7.egg/opengever/ogds/base/sources.py", line 777, in search
    self.terms.append(self.getTerm(result.id()))
  File "apps/eggs/opengever.core-2019.3.4-py2.7.egg/opengever/ogds/base/sources.py", line 829, in getTerm
    '{}{}'.format(self.GROUP_PREFIX, obj.id()),

UnicodeEncodeError: 'ascii' codec can't encode character u'\xe4' in position 9: ordinal not in range(128)