[7.0][base_rml_edit] Decode issue on save

[Yajo]

Trying to edit the default Quotation RML content, just add a space there and save, and you get this error:

ordinal not in range(128)
Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.7/openerp/netsvc.py", line 296, in dispatch_rpc
    result = ExportService.getService(service_name).dispatch(method, params)
  File "/usr/lib/pymodules/python2.7/openerp/service/web_services.py", line 626, in dispatch
    res = fn(db, uid, *params)
  File "/usr/lib/pymodules/python2.7/openerp/osv/osv.py", line 190, in execute_kw
    return self.execute(db, uid, obj, method, *args, **kw or {})
  File "/usr/lib/pymodules/python2.7/openerp/osv/osv.py", line 132, in wrapper
    return f(self, dbname, *args, **kwargs)
  File "/usr/lib/pymodules/python2.7/openerp/osv/osv.py", line 199, in execute
    res = self.execute_cr(cr, uid, obj, method, *args, **kw)
  File "/usr/lib/pymodules/python2.7/openerp/osv/osv.py", line 187, in execute_cr
    return getattr(object, method)(cr, uid, *args, **kw)
  File "/usr/lib/pymodules/python2.7/openerp/osv/orm.py", line 4255, in write
    result += self._columns[field].set(cr, self, id, field, vals[field], user, context=rel_context) or []
  File "/usr/lib/pymodules/python2.7/openerp/osv/fields.py", line 1159, in set
    self._fnct_inv(obj, cr, user, id, name, value, self._fnct_inv_arg, context)
  File "/opt/openerp-community-repo-installer/addons/base_rml_edit/ir_actions.py", line 38, in _report_content_txt_inv
    self.write(cr,uid,id,{'report_rml_content':str(value)},context=context)
UnicodeEncodeError: 'ascii' codec can't encode character u'\xb0' in position 9427: ordinal not in range(128)