[Bug]: deleting all routes for a network leads to network page down.

[windoflake]

🐛 Describe the Bug

When I tried to delete all the routes for a network, then you can't enter the network page anymore. Please see below picture for the reported error description:

🔍 Steps to Reproduce

1. Create any new network.
2. Delete the only route for the network like below:
   

🔧 Deployment Type

• Docker
• Standalone

✨ Expected Behavior

Users could enter the network page and no errors should be reported when all the routes for a network is removed.

📋 ZTNET Logs

No response

🖼 Screenshots

No response