fixes nxos_interface (#24199)

Signed-off-by: Trishna Guha <trishnaguha17@gmail.com>

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

@@ -221,10 +221,11 @@ def get_manual_interface_attributes(interface, module):
     if get_interface_type(interface) == 'svi':
         command = 'show interface {0}'.format(interface)
         try:
-            body = execute_show_command(command, module)[0]
+            body = run_commands(module, [command])[0]
         except IndexError:
             return None
 
+        if body:
             command_list = body.split('\n')
             desc = None
             admin_state = 'up'