[Gravity/Sphere/Vortex] Fixes for PHP 7.2.

Review Request #537 — Created Dec. 12, 2017 and submitted — Latest diff uploaded

pprkut
Lunr
2cbb149...
lunr
Apparently, PHP 5.6 not having TypeError is not a problem, since the respective code is never executed.
No clue what the deal with empty() not working for $this->configuration['db']['ro_host'] is. For some reason empty() makes it return NULL.

Unit tests on 7.2 and 5.6

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