##### SUMMARY
I found another issue that is similar to the issue reported in https://github.com/ansible/ansible/issues/61568.

In this case if I run the playbook described below I encounter the following issue:

```
TASK [nxos_become : run commands with become] ***********************************************************************************************************************************************************
task path: /root/agents-ci/ansible/test/integration/targets/nxos_become/tests/cli/sanity.yaml:7
<n3k.example.com> attempting to start connection
<n3k.example.com> using connection plugin network_cli
<n3k.example.com> found existing local domain socket, using it!
<n3k.example.com> updating play_context for connection
<n3k.example.com> 
The full traceback is:
Traceback (most recent call last):
  File "/root/agents-ci/ansible/bin/ansible-connection", line 300, in main
    conn.update_play_context(pc_data)
  File "/root/agents-ci/ansible/lib/ansible/module_utils/connection.py", line 185, in __rpc__
    raise ConnectionError(to_text(msg, errors='surrogate_then_replace'), code=code)
ConnectionError: 'NoneType' object has no attribute 'endswith'

fatal: [n3k-priv]: FAILED! => {
    "msg": "'NoneType' object has no attribute 'endswith'"
}


```
##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
nxos

##### ANSIBLE VERSION
<!--- Paste verbatim output from "ansible --version" between quotes -->
```paste below
ansible 2.10.0.dev0
  config file = /root/agents-ci/ansible/test/integration/ansible.cfg
  configured module search path = [u'/root/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /root/agents-ci/ansible/lib/ansible
  executable location = /root/agents-ci/ansible/bin/ansible
  python version = 2.7.12 (default, Dec  4 2017, 14:50:18) [GCC 5.4.0 20160609]

```


##### STEPS TO REPRODUCE
Just like I describe in https://github.com/ansible/ansible/issues/61568, if I checkout the commit right before https://github.com/ansible/ansible/commit/7d3c4a88823846cbcea7c61de38658a6d63d4265 I don't see the problem.

I decided to open a separate issue for this though because if I patch in the potential fix (https://github.com/ansible/ansible/pull/61570) I still see the issue.

##### EXPECTED RESULTS
Test should pass on all NXOS platforms.

##### ACTUAL RESULTS
Test fails with error message

```
Traceback (most recent call last):
  File "/root/agents-ci/ansible/bin/ansible-connection", line 300, in main
    conn.update_play_context(pc_data)
  File "/root/agents-ci/ansible/lib/ansible/module_utils/connection.py", line 185, in __rpc__
    raise ConnectionError(to_text(msg, errors='surrogate_then_replace'), code=code)
ConnectionError: 'NoneType' object has no attribute 'endswith'
```

Here is the playbook that exposes the issue.

Command to execute the playbook: `ansible-playbook -i ~/hosts nxos.yaml -vvvv`

**nxos.yaml**
```yaml
---
# This first play configures a new user called test_ansible and sets
# the enable secret
- name: Setup test user for role validation
  hosts: nxos
  gather_facts: no
  connection: network_cli

  tasks:
    - set_fact: nxos_priv_host="{{ hostvars[inventory_hostname]["groups"]["nxos_privilage_user"][0] }}"
    - set_fact: priv_password="{{ hostvars[nxos_priv_host]["ansible_ssh_pass"] }}"

    - name: Enable Feature Privilege
      nxos_config:
        lines:
          - feature privilege

    - name: Configure user ansible_test with role priv-14
      nxos_config:
        lines:
          - no username test_ansible
          - "username test_ansible password {{ priv_password }} role priv-14"
          - enable secret 0 cisco

# This second play uses the nxos_become role to verify that ansible
# can login as the test user created in the first play and then use
# become to enable a higher privilage level
- name: Verify privliage role escalation using become
  hosts: nxos_privilage_user
  gather_facts: no
  connection: local

  vars:
    debug: false

  roles:
    - { role: nxos_become }

# This third and final play is used to cleanup the test user
- name: Cleanup test user
  hosts: nxos
  gather_facts: no
  connection: network_cli

  tasks:
    - name: Remove user ansible_test
      nxos_config:
        lines:
          - no username test_ansible
          - no enable secret
```

**nxos_become role**
Everything committed into the current `devel` role  but replace `targets/nxos_become/tests/cli/sanity.yaml` with:

```yaml
---
- debug: msg="START connection={{ ansible_connection }}/sanity.yaml"
- debug: msg="Using provider={{ connection.transport }}/sanity.yaml"
  when: ansible_connection == "local"

- block:
  - name: run commands with become
    nxos_command:
      commands: 'show privilege'
    become: yes
    register: result

  - assert:
      that:
        - "'Current privilege level: 15' in result['stdout'][0]"

- debug: msg="END connection={{ ansible_connection }}/sanity.yaml"

```
if timeout < 0:
            raise AnsibleConnectionFailure("'%s' timer value '%s' is invalid, value should be greater than or equal to zero." % (timer_name, timeout))
    def transport_test(self, connect_timeout):