Fixed mkdir flow for MacOS

[maxsharabayko]

Independent from how the output directory is specified,

• --output="./output"
• --output="/Users/<username/.../output"

the script determines the absolute path, and then goes (MacOS):

Directory /
Directory /Users
Directory /Users/<username>
...

And throws the EISDIR error trying to create directory / on MacOS.

This PR adds two additional checks to the mkDirByPathSync(..) function.

1. Add handling of "EISDIR".

2. Create a directory only if the path does not exist. Using additional condition fs.existsSync(curDir)