Updated sprintf usage; Simplified isset usage

[df2k2]

Description (*)

1. Simplified if condition using AND-logic (&&) for checking two isset statements to use a single one with multiple parameters. By definition isset():

If multiple parameters are supplied then isset() will return TRUE only if all of the parameters are set. Evaluation goes from left to right and stops as soon as an unset variable is encountered.
https://secure.php.net/manual/en/function.isset.php

2. Updated sprintf() usage:

i. Removed unnecessary sprintf() where no parameters are specified.
ii. Removed unused parameters from sprintf() usage.

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]

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[magento-engcom-team]

Hi @sidolov, thank you for the review.
ENGCOM-4191 has been created to process this Pull Request

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