Asset Locations overlay when adding them a second time to the model

[Santonia27]

Preliminary Checklist

• I have searched the existing issues list for similar reports and found none. If you did find a similar issue, please add a comment to the existing issue instead of opening a new one.
• I have verified that the issue exists in the latest version of DelftDashboard and its dependencies. Please update to the latest version and check if the issue still exists.

Severity Level

None

Steps to reproduce

1. Create Model boundaries
2. Go to exposure tab and add assets from NSI
3. (Run Model)
4. Create new boundaries or add a second time assets. The user might do that to include the OSM roads because she/he forgot in the first run or want to update the model boundaries.

Current behaviour

Currently when assets are added a second time they simply overlay on the previous layer of assets

Desired behaviour

• A warning window should ask the user if he wants to remove the old layer and add a new one
• The layer below should disappear

Additional context

No response