[Yaml] Warnings emitted if configuration file is empty

[tomzx]

When constructing a new Config object, if the target file is empty, the following two warnings are emitted:

Warning: array_replace_recursive(): Argument #2 is not an array in src/Config.php on line 65
Warning: array_merge(): Argument #2 src/AbstractConfig.php on line 39

config/src/Config.php

Line 65 in b7ab317

$this->data = array_replace_recursive($this->data, $parser->parse($path));

$this->data = array_replace_recursive($this->data, $parser->parse($path));

This is due to the fact that the Yaml parser will return null if the file is empty (thus not an array). An "easy" fix would be to cast the result of $parser->parse($path) to an array:

$this->data = array_replace_recursive($this->data, (array)$parser->parse($path));

What do you think?

[DavidePastore]

Nice catch! Can you create a PR with this check (and a related test)?