Description
On Edit promo screen, in existing condition section's select box two empty options are shown.
Please find the screenshot for more detail.
Reason and Solution:
As per the code in EditProductPromoRules.ftl,
<option value = "${carrierShippingMethod!}">${carrierParty!} ${description}</option
<option value = ""> </option>
And the carrierParty is calculated above, if it is not available the first option will show automatically as empty option
<option value = "${carrierShippingMethod!}">${carrierParty!} ${description}</option>
So, we don't need the second empty option field and can remove it.
<option value = ""> </option>