Check if .phpstorm.meta.php is a folder before writing
Check if .phpstorm.meta.php is a folder before writing

According to JB documentation .phpstorm.meta.php can be a folder with multiple files. In this case a new should should be created for Pimple map.

@link https://confluence.jetbrains.com/display/PhpStorm/PhpStorm+Advanced+Metadata
JBZoo/PimpleDumper