Encryption fails if ANSIBLE_VAULT_PASSWORD_FILE is defined

[jmgrady]

Describe the bug
If the environment variable, ANSIBLE_VAULT_PASSWORD_FILE is defined, encryption will fail with the following exception:

ERROR! Unexpected Exception, this is probably a bug: 'tuple' object has no attribute 'append'

To Reproduce
Steps to reproduce the behavior:

1. Set and export ANSIBLE_VAULT_PASSWORD_FILE;
2. Start atom
3. Configure ansible-vault package as follows:
   • Set Ansible Vault absolute path
   • Enable automatic de- and encrypt: false
   • User vault password file defined in ansible.cfg: false
   • Use specific vault password file: true
   • Vault password file path: path to password file, e.g. /home/grady/.ansible-vault
4. Open a file that has been encrypted using ansible-vault
5. Decrypt by pressing Ctrl-Alt-0; file is decrypted correctly
6. Encrypt the file by pressing Ctrl-Alt-0; file is not encrypted and an error is thrown:

ERROR! Unexpected Exception, this is probably a bug: 'tuple' object has no attribute 'append'

Expected behavior
Expected the file to be re-encrypted.

Note that the package throws the same error if automatic decrypt/encrypt is enabled and the file is closed.

Desktop:

• Atom version 1.44.0
• Ansible version 2.8.1
• OS: Ubuntu 18.04.4 LTS

Additional context
Add any other context about the problem here.