Note deletion strange when selected via note list

[hauke96]

1. Go to the note list
2. Select note (tap on one) → map opens (note doesn't have the selection style until #74 is fixed) and the text field shows the text of the note
3. Delete the note

Expected: Input controls (text field, image list, ...) is empty + note removed from map

Actual: Only input fields are empty

When selecting the note via the map (after the steps above), the app crashes.