Segment with "None" QoS Profile

[adarobin]

Describe the bug

It appears that the provider does not work correctly with segments that have the QoS profile set to what is called "None" in the GUI along with other segment profile types. This results in a change being shown for a segment when there should not be.

For example, a segment configured like this:

resource "nsxt_policy_segment" "test" {
  display_name        = "test"
  transport_zone_path = data.nsxt_policy_transport_zone.overlay.path
  connectivity_path   = data.nsxt_policy_tier1_gateway.tier1_gw.path

  subnet {
    cidr = "10.10.10.0/24"
  }

  discovery_profile {
    ip_discovery_profile_path  = data.nsxt_policy_ip_discovery_profile.default_vlan_ip_discovery_profile.path
    mac_discovery_profile_path = data.nsxt_policy_mac_discovery_profile.default_mac_discovery_profile.path
  }

  security_profile {
    security_profile_path   = nsxt_policy_segment_security_profile.segment_security_allow_dhcp.path
    spoofguard_profile_path = data.nsxt_policy_spoofguard_profile.default_spoofguard_profile.path
  }
}

Results in a plan showing this:

      - qos_profile {
          
-
 binding_map_path = "/infra/segments/31168961-a467-40b7-ba5c-c911a4970f25/segment-qos-profile-binding-maps/26cff0a8-ddd4-4944-8d79-f905e96030e6" 
-> null
          - revision         = 0 -> null
        }

Poking around with the API a bit, it appears that qos_profile_path is set to "". If I attempt to add a block like this to the segment, terraform throws an error for "Invalid policy path" before the plan runs:

qos_profile {
  qos_profile_path = ""
}

Reproduction steps

1. Create a segment with a custom security profile and the QoS profile set to "None" manually in the GUI.
2. Import the segment to Terraform and run a plan.
3. The plan output will show that terraform wants to make a change to the network's qos_profile
   ...

Expected behavior

Terraform allows the qos_profile_path on the segment to be set to "" or handles the qos_block missing differently.

Additional context

No response