[Forwardport] Issue 15469: Javascript error dropdowns.js

[dmytro-ch]

Original Pull Request

#15499
Fixes Javascript error in dropdowns.js by properly initializing the el variable. options.autoclose can now be set to false

Description

Initialize the el variable outside of the condition checking for options.autoclose === true

Fixed Issues

1. lib/web/mage/dropdowns.js fails when autoclose is set to true #15469: lib/web/mage/dropdowns.js fails when autoclose is set to true

Manual testing scenarios

1. In a javascript file, call dropdown on an element with autoclose: false

$(this.selector).dropdown({
    autoclose: false
});

2. Open and close the dropdown, verifying no javascript errors occur in the console

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-engcom-team]

Hi @dmytro-ch. Thank you for your contribution.
Changes from your Pull Request will be available with the upcoming 2.3.0 release.