Handle error for rc path

[BioPhoton]

Error

> npx @push-based/user-flow -p packages/ngx-fast-icon-demo/perf collect

internal/fs/utils.js:312
    throw err;
    ^

Error: EISDIR: illegal operation on a directory, read
    at Object.readSync (fs.js:614:3)
    at tryReadSync (fs.js:383:20)
    at readFileSync (fs.js:420:19)
    at readFile (C:\Users\micha\git\ngx-fast-icon\node_modules\@push-based\user-flow\src\lib\core\utils\file.js:13:38)
    at readRcConfig (C:\Users\micha\git\ngx-fast-icon\node_modules\@push-based\user-flow\src\lib\core\rc-json\index.js:9:48)