Blank description prints '_null' instead of nothing

[freeform-sg]

When the membership discount code text is being appended to the affected price option label, the text " null" is being added after the savings value, it appears to be the result of leaving the discount code's description blank. We're using " " as a description as a workaround.

[amruta-kashikar]

I want to work on this issue

[mlutfy]

CiviDiscount has moved to CiviCRM's Gitlab! (see #273)

If you are interested in this issue, you can follow it here:
https://lab.civicrm.org/extensions/cividiscount/-/issues/248