win_copy fails when copy an empty subfolder

[cesarfn4]

SUMMARY

ISSUE TYPE

• Bug Report

COMPONENT NAME

win_copy

ANSIBLE VERSION

ansible-playbook 2.8.0.dev0 (devel 4d0f2e632c) last updated 2018/12/17 14:57:44 (GMT +000)
  config file = /etc/ansible/ansible.cfg
  configured module search path = [u'/var/lib/awx/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /var/lib/awx/ansible/lib/ansible
  executable location = /var/lib/awx/ansible/bin/ansible-playbook
  python version = 2.7.5 (default, Aug  4 2017, 00:39:18) [GCC 4.8.5 20150623 (Red Hat 4.8.5-16)]

STEPS TO REPRODUCE

Create a folder with empty sub-folders and try to copy them to another sub-folder.

• Source: C:\Data\Test

Data
└── Test
    ├── test1  --> empty
    ├── test2  --> empty
    └── test3  --> empty

• Target: C:\Data_Backup\Test\..

Data_Backup
└── Test --> empty

Playbook:

---
- name: Testing windows copy module
  hosts: windows

  tasks:
  - set_fact:
      source: "C:\\Data\\Test"
      target: "C:\\Data_Backup\\Test\\.."
 
  - name: "copy"
    win_copy:
      src: "{{ source }}"
      dest: "{{ target }}"
      remote_src: True

EXPECTED RESULTS

It should work fine but without displaying any error.

ACTUAL RESULTS

It is working as expected, but it is displaying the following error.

The full traceback is:
The property "length" cannot be found in the input for any objects.
At line:136 char:39
+             $size = ($dir_files_sum | Measure-Object -property length -sum).Sum
+                                       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidArgument: (:) [Measure-Object], PSArgumentException
    + FullyQualifiedErrorId : GenericMeasurePropertyNotFound,Microsoft.PowerShell.Commands.MeasureObjectCommand

ScriptStackTrace:
at Get-FileSize, <No file>: line 136
at <ScriptBlock>, <No file>: line 355

fatal: [windows-1.redhat.local]: FAILED! => {
    "changed": false, 
    "dest": "C:\\Data_Backup\\Test\\..", 
    "msg": "Unhandled exception while executing module: Cannot process argument because the value of argument \"Property\" is not valid. Change the value of the \"Property\" argument and run the operation again.", 
    "src": "C:\\Data\\Test"
}

Attached full output:
debug_output.txt

[ansibot]

Files identified in the description:

• lib/ansible/modules/windows/win_copy.py

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[ansibot]

cc @dagwieers @jborean93 @jhawkesworth @nitzmahone
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