fix MySQL initial setup

[dyseg]

Error during the very first startup when the DB tables should be created:

Mysql: error while creating db: mysql_error (1065): "Query was empty"

The problem is that after the mysql.sql file content is split by ';', during the last loop the statement variable will only contain a newline character, which causes the mentioned MySQL error.

gerbera/src/database/mysql/mysql_database.cc

Line 212 in d6e57d1

for (const auto& statement : splitString(sql, ';')) {

[KarlStraussberger]

Thank you.