assemble module: Adds an extra line if the delimiter parameter is set to "\n"

[in-in]

SUMMARY

I want to add a new line between my fragments. For this, I set the delimiter parameter to '/n"', but I got two lines between the fragments. In case I omit the delimiter parameter my fragments are combined without any delimiter

ISSUE TYPE

• Bug Report

COMPONENT NAME

assemble

ANSIBLE VERSION

ansible 2.6.3
  config file = /home/mint/assemble_module_test/ansible.cfg
  configured module search path = ['/home/mint/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/local/lib/python3.6/dist-packages/ansible
  executable location = /usr/local/bin/ansible
  python version = 3.6.5 (default, Apr  1 2018, 05:46:30) [GCC 7.3.0]

CONFIGURATION

ANSIBLE_NOCOWS(/home/mint/assemble_module_test/ansible.cfg) = True
DEFAULT_HOST_LIST(/home/mint/assemble_module_test/ansible.cfg) = ['/home/mint/assemble_module_test/hosts.yml']

OS / ENVIRONMENT

Host: Linux Mint 19,
Target: same

STEPS TO REPRODUCE

Minimal test-case repository: https://github.com/in-in/assemble_module_test

- hosts: local
  tasks:
    - name: create main file
      assemble:
        src: "./fragments"
        dest: "./.aliases.sh"
        delimiter: "\n"

EXPECTED RESULTS

.aliases.sh should look like this:

# npm: fix everything
alias npmplease='rm -rf node_modules && npm cache clean && npm install'

# rsnapshot: testing the configuration
alias test_backup="rsnapshot -c ~/.config/rsnapshot/rsnapshot.conf configtest"

# rsnapshot: run backup
alias backup="rsnapshot -V -c ~/.config/rsnapshot/rsnapshot.conf weekly"

# wireguard: up the tunnel
alias wgu='sudo wg-quick up wg0'

# wireguard: down the tunnel
alias wgd='sudo wg-quick down wg0'

ACTUAL RESULTS

# npm: fix everything
alias npmplease='rm -rf node_modules && npm cache clean && npm install'


# rsnapshot: testing the configuration
alias test_backup="rsnapshot -c ~/.config/rsnapshot/rsnapshot.conf configtest"

# rsnapshot: run backup
alias backup="rsnapshot -V -c ~/.config/rsnapshot/rsnapshot.conf weekly"


# wireguard: up the tunnel
alias wgu='sudo wg-quick up wg0'

# wireguard: down the tunnel
alias wgd='sudo wg-quick down wg0'

PS. I found that the problem is in my inventory file. More exactly in this line: ansible_python_interpreter: "{{ ansible_playbook_python }}"
At runtime, it translates to: ansible_python_interpreter: "python3"
If I change this line to ansible_python_interpreter: "python2", it will prevent the appearance of one extra line in the "assemble" module. But Python2 ruins another part of my configuration (dconf module)

[ansibot]

Files identified in the description:

• lib/ansible/modules/files/assemble.py

If these files are inaccurate, please update the component name section of the description or use the !component bot command.

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[ansibot]

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