Throw exception when loading data from file failed

[arogachev]

Currently the empty array is returned:

rbac-php/src/CommonStorage.php

Lines 24 to 34 in cb61807

	protected function loadFromFile(string $file): array
	{
	if (is_file($file)) {
	/**
	* @psalm-suppress UnresolvableInclude
	*/
	return require $file;
	}
	return [];
	}

[samdark]

That's checking if path is a file, not that it failed loading. On loading failure, an exception would be thrown. The reason for current code is for the file to be created automatically.