do not override lldp neighbors nxos_facts (#48087)

Signed-off-by: Trishna Guha <trishnaguha17@gmail.com>
(cherry picked from commit 27075ab7dd)

lib/ansible/modules/network/nxos/nxos_facts.py

@@ -377,6 +377,7 @@ class Interfaces(FactsBase):
     def populate(self):
         self.facts['all_ipv4_addresses'] = list()
         self.facts['all_ipv6_addresses'] = list()
+        self.facts['neighbors'] = {}
         data = None
 
         data = self.run('show interface', output='json')
@@ -412,6 +413,7 @@ class Interfaces(FactsBase):
 
         self.facts['neighbors'].pop(None, None)  # Remove null key
 
+
     def populate_structured_interfaces(self, data):
         interfaces = dict()
         for item in data['TABLE_interface']['ROW_interface']: