Empty search entries are being created for device asset tags

[jeremystretch]

Deployment Type

NetBox Cloud

NetBox Version

v3.7.4

Python Version

3.11

Steps to Reproduce

1. Create a new device and note its database ID
2. In the NetBox shell, inspect all search entries associated with it:

ct = ContentType.objects.get_for_model(Device)
device_id = 107
entries = CachedValue.objects.filter(object_type=ct, object_id=device_id)
for entry in entries:
    print(f'{entry.field}: {entry.value}')

Expected Behavior

Only fields which have a meaningful value set should have search entries created.

Observed Behavior

After creating a device with a description, I see three entries for it:

asset_tag: None
name: device1
description: asdasdasd

The value of asset_tag is null.

[jeremystretch]

This bug appears to affect any field which returns a null value (None).