base_geoengine_demo: javascript errors

[Javi Meléndez]

I am getting some javascript errors when accessing geoengine view and geo_edit_map widget

In geoengine view, when there is no record, I get:
- TypeError: f is undefined (firefox 30.0)
- Uncaught TypeError: Cannot read property 'attributes' of undefined (chrome 35.0, opera 22.0)

To reproduce on base_geoengine_demo:
- Open geoengine.demo.automatic.retailing.machine list view
- Delete all records
- Open geoengine view -> error

When I am editing a geo_point for the second time, I get:
- TypeError: a.layer is null (firefox 30.0)
- Uncaught TypeError: Cannot read property 'selectedFeatures' of null (chrome 35.0, opera 22.0)

To reproduce on base_geoengine_demo:
- Open geoengine.demo.automatic.retailing.machine list view
- Edit an existing record
- Select the point of the map and move it
- Save changes
- Click edit again
- Select the point -> error