title: Unknown report type: webkit Error when printing report?
body: <p>I been with the following error for the past few days and I can't get a clue how to proceed. </p>
  
  <p>The full error is:</p>
  
  <pre><code>2015-01-26 17:29:25,162 21218 ERROR myodoo openerp.service.report: Exception: Unknown report type: webkit
  Traceback (most recent call last):
    File "/opt/odoo/openerp/service/report.py", line 93, in go
      result, format = openerp.report.render_report(cr, uid, ids, object, datas, context)
    File "/opt/odoo/openerp/report/__init__.py", line 40, in render_report
      return registry['ir.actions.report.xml'].render_report(cr, uid, ids, name, data, context)
    File "/opt/odoo/openerp/api.py", line 237, in wrapper
      return old_api(self, *args, **kwargs)
    File "/opt/odoo/openerp/addons/base/ir/ir_actions.py", line 155, in render_report
      return new_report.create(cr, uid, res_ids, data, context)
    File "/opt/odoo/openerp/report/report_sxw.py", line 391, in create
      raise NotImplementedError(_('Unknown report type: %s') % report_type)
  NotImplementedError: Unknown report type: webkit
  
  2015-01-26 17:29:25,397 21218 ERROR myodoo openerp.addons.web.controllers.main: An exception occured during an http request
  Traceback (most recent call last):
    File "/opt/odoo/addons/web/controllers/main.py", line 69, in wrap
      return f(*args, **kwargs)
    File "/opt/odoo/addons/web/controllers/main.py", line 1576, in index
      request.session.db, request.session.uid, request.session.password, report_id)
    File "/opt/odoo/openerp/http.py", line 807, in proxy_method
      result = dispatch_rpc(self.service_name, method, args)
    File "/opt/odoo/openerp/http.py", line 100, in dispatch_rpc
      result = dispatch(method, params)
    File "/opt/odoo/openerp/service/report.py", line 34, in dispatch
      res = fn(db, uid, *params)
    File "/opt/odoo/openerp/service/report.py", line 141, in exp_report_get
      return _check_report(report_id)
    File "/opt/odoo/openerp/service/report.py", line 119, in _check_report
      raise openerp.osv.orm.except_orm(exc.message, exc.traceback)
  except_orm: (u'Unknown report type: webkit', (&lt;type 'exceptions.NotImplementedError'&gt;, NotImplementedError(u'Unknown report type: webkit',), &lt;traceback object at 0x7fa2f9af8dd0&gt;))
  </code></pre>
  
  <p>I been developing on my module so I thought it was something I touched, but even when I install previous working versions of the module I still get the same error. </p>
  
  <p>That makes me feel that there might be a change in the system but I checked if <strong>wkhtmltopdf</strong> is working and everything seems normal.</p>
  
  <p>Any clue on where to look will be really appreciated.</p>
  
  <p>Thanks!</p>