Compatibility with PHP 7.2

[musicmouse]

It looks like the included phpmyadmin in the latest Vesta is from an old version that doesn't support PHP 7.2 very well. I get the warning "count(): parameter must be an array or an object" when I click on Import. This is one of the classical PHP 7.2 warnings as that version no longer wants NULL values for count().

The included phpmyadmin has version 4.6.6deb5 while the latest version is 4.8.5.