Remove redundant code for clarity

[akiojalehto]

Description

$curl->read() will always return a string even if curl_exec fails because there is preg_replace at the end. Because the $data can never be identical to false so I think this redundant piece of code should be removed.

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)