Syntax errors with PHP5.5: tests not being run

Problem/Motivation

Tests are not being run since https://www.drupal.org/pift-ci-job/739564.
We introduced:

$shown_profile = ((array) $elements[0])[0];

which is not valid for 5.5

Proposed resolution

Use an additional variable preventing direct access.

Remaining tasks

Patch with fix ensuring it passes for php5.5.

User interface changes

None

API changes

None

Data model changes

None