##### SUMMARY
get_vm() method vmware.py module utility fails with KeyError if uuid is not in the module param from whch method is invoked

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
vmware.py module util

##### ANSIBLE VERSION
```
ansible 2.9.0.dev0
```

##### OS / ENVIRONMENT
Ubuntu 16

##### STEPS TO REPRODUCE
Creating new module. 'uuid' is not in my module arguments. 
Called get_vm() 

pyv = PyVmomi(module=module)
vm = pyv.get_vm()

##### EXPECTED RESULTS
Call should return vm_id if it exists

##### ACTUAL RESULTS
```
Get error
An exception occurred during task execution. To see the full traceback, use -vvv. The error was: KeyError: 'uuid'
fatal: [localhost]: FAILED! => {"changed": false, "module_stderr": "Traceback (most recent call last):\n  File
\"/home/vmware/.ansible/tmp/ansible-tmp-1565095783.75439-259726275713856/AnsiballZ_vmware_content_deploy_template.py\", line 125, in <module>\n    _ansiballz_main()\n  File \"/home/vmware/.ansible/tmp/ansible-tmp-1565095783.75439-259726275713856/AnsiballZ_vmware_content_deploy_template.py\", line 117, in _ansiballz_main\n    invoke_module(zipped_mod, temp_path, ANSIBALLZ_PARAMS)\n  File \"/home/vmware/.ansible/tmp/ansible-tmp-1565095783.75439-259726275713856/AnsiballZ_vmware_content_deploy_template.py\", line 51, in invoke_module\n    spec.loader.exec_module(module)\n  File \"<frozen importlib._bootstrap_external>\", line 665, in exec_module\n  File \"<frozen importlib._bootstrap>\", line 222, in _call_with_frames_removed\n  File \"/tmp/ansible_vmware_content_deploy_template_payload_69cftg21/__main__.py\", line 271, in <module>\n  File \"/tmp/ansible_vmware_content_deploy_template_payload_69cftg21/__main__.py\", line 241, in main\n  File \"/tmp/ansible_vmware_content_deploy_template_payload_69cftg21/ansible_vmware_content_deploy_template_payload.zip/ansible/module_utils/vmware.py\", line 891,
in get_vm\nKeyError: 'uuid'\n", "module_stdout": "", "msg": "MODULE FAILURE\nSee stdout/stderr for the exact error", "rc": 1}

```

finally:
                raise_from(TaskError(error_msg, host_thumbprint), task.info.error)
        if task.info.state in [vim.TaskInfo.State.running, vim.TaskInfo.State.queued]:
            sleep_time = min(2 ** failure_counter + randint(1, 1000) / 1000, max_backoff)
            time.sleep(sleep_time)
            failure_counter += 1
def wait_for_vm_ip(content, vm, timeout=300):
    facts = dict()
    interval = 15
    while timeout > 0:
        _facts = gather_vm_facts(content, vm)
        if _facts['ipv4'] or _facts['ipv6']:
            facts = _facts
            break
        time.sleep(interval)
        timeout -= interval
    return facts
def find_obj(content, vimtype, name, first=True, folder=None):
    container = content.viewManager.CreateContainerView(folder or content.rootFolder, recursive=True, type=vimtype)
    
    obj_list = [obj for obj in container.view if not name or to_text(obj.name) == to_text(name)]
    container.Destroy()
    
    if first:
        if obj_list:
            return obj_list[0]
        return None
    
    return obj_list
def find_dvspg_by_name(dv_switch, portgroup_name):