fixes #27066 - nxos_acl errors when there are 0 or 1 access lists configured (#29076)

* fixes #27066

* replace type() with isinstance()

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

@@ -239,11 +239,20 @@ def get_acl(module, acl_name, seq_number):
     acl_body = {}
 
     body = execute_show_command(command, module)[0]
-    all_acl_body = body['TABLE_ip_ipv6_mac']['ROW_ip_ipv6_mac']
+    if body:
+        all_acl_body = body['TABLE_ip_ipv6_mac']['ROW_ip_ipv6_mac']
+    else:
+        # no access-lists configured on the device
+        return {}, []
 
-    for acl in all_acl_body:
-        if acl.get('acl_name') == acl_name:
-            acl_body = acl
+    if isinstance(all_acl_body, dict):
+        # Only 1 ACL configured.
+        if all_acl_body.get('acl_name') == acl_name:
+            acl_body = all_acl_body
+    else:
+        for acl in all_acl_body:
+            if acl.get('acl_name') == acl_name:
+                acl_body = acl
 
     try:
         acl_entries = acl_body['TABLE_seqno']['ROW_seqno']