Getting fatal error while accessing Module configuration page.

Issue fixed, Please review.

It is a simple isset() check and it will work.
The patch looks good to me, We can go with it.
Moving to RTBC

Thank you for the patch and bug report. The error was not fatal but a warning and should not have prevented the module from working. However, there is a change in the DEV version (2.0.x-dev) of this module that includes a settings install file which should prevent the warning.

Please could you test that version and if it's working, then I will create an `alpha2` version.

Thanks.

Created a new MR.

Changes work for me. so, added them as an MR.