Warning: is_readable() expects parameter 1 to be a valid path

[sreichel]

From https://magento.stackexchange.com/questions/270687/warning-is-readable-expects-parameter-1-to-be-a-valid-path

Not sure if supress error is best idea ... see #85

Untested, but a file_exists() check before c/should cover this.

[manezaf8]

The thing is we are not suppose to update the [ lib ] Folder since we working with big data and most of the functions are related, so how to go about it to stop this warning from happening ?