##### 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}

```

"""
        Takes a string in the format
            [datastore_name] path/to/vm_name.vmdk
        Returns a tuple with multiple strings:
        1. datastore_name: The name of the datastore (without brackets)
        2. vmdk_fullpath: The "path/to/vm_name.vmdk" portion
        3. vmdk_filename: The "vm_name.vmdk" portion of the string (os.path.basename equivalent)
        4. vmdk_folder: The "path/to/" portion of the string (os.path.dirname equivalent)
        """
        try:
            datastore_name = re.match(r'^\[(.*?)\]', vmdk_path, re.DOTALL).groups()[0]
            vmdk_fullpath = re.match(r'\[.*?\] (.*)$', vmdk_path).groups()[0]
            vmdk_filename = os.path.basename(vmdk_fullpath)
            vmdk_folder = os.path.dirname(vmdk_fullpath)
            return datastore_name, vmdk_fullpath, vmdk_filename, vmdk_folder
        except (IndexError, AttributeError) as e:
            self.module.fail_json(msg="Bad path '%s' for filename disk vmdk image: %s" % (vmdk_path, to_native(e)))
    def find_vmdk_file(self, datastore_obj, vmdk_fullpath, vmdk_filename, vmdk_folder):