Fixed #17861 Customer Name Prefix shows white space when extra separator is addes

[shikhamis11]

Fixed #17861 Customer Name Prefix shows white space when extra separator is addes

White space option is added when extra separator is added.

Preconditions

1. php7.1
2. Magento 2.2.5

Steps to reproduce

1.In admin menu Store->Configuration
Select "Customer Configuration" under confifuration.
Add "Mr;Ms;Mrs;" in "Prefix Dropdown Options"

Expected result

1. It should avoid the white space option, if extra separator is added.

Actual result

1.It is displaying extra white space option, and In case of it is required, It throws validation.

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 @shikhamis11. Thank you for your contribution
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[magento-engcom-team]

Hi @sivaschenko, thank you for the review.
ENGCOM-4146 has been created to process this Pull Request

[ghost]

Hi @shikhamis11, thank you for your contribution!
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