vw_tww_overflow: symbol jumps and python-error

[urskaufmann]

Describe the bug
The symbol of the overflows is not helpful. The curve is nice, but the point symbol is not at the place, where the overflow is and it happens, that the point symbol jumps of the zoom changes.
If I open the attribute table, I get python-errors.

To Reproduce
Exact steps to reproduce the behavior:

1. New TWW installation Release 2024.03
2. Go to one of the overflows, zoom in and out (often it's without jump, sometimes the point symbol jumps)
3. open the attribute table of vw_tww_overflow
4. See error

Screenshots / data

1:39, Symbol in the right side

1:31, Symbol in the left side

1:16, Symbol on the other side

Attribute table open -> python error

Desktop (please complete the following information):

• TWW version 2024.03
• QGIS Version 3.34.10
• OS Win 10