"Edit DNS Zone" is empty
When you click "Edit DNS Zone", from your WHM >> DNS function option and the DNS list is empty.
To get such problem resolved you have to check the the cpanel updates option.
Login with root to your
WHM >> Server Configuration >> Update Preferences option .
Make sure that your cpanel is updated with
STABLE Builds (Manual Update Only)
If it in RELEASE Builds (Automatic) change it to STABLE Builds .