Suffix may be used before it is assigned a value

CID 350722 (#5 of 7): Bad use of null-like value (FORWARD_NULL)
        12. invalid_operation: Invalid operation on null-like value suffix.
    145        r.authority.append(
    146            dns.rrset.from_text(
    147                "icky.ptang.zoop.boing." + suffix,
    148                1,
    149                IN,
    150                NS,
    151                "a.bit.longer.ns.name." + suffix,
    152            )
    153        )

bin/tests/system/qmin/ans3/ans.py

@@ -57,6 +57,7 @@ def create_response(msg):
     qname = m.question[0].name.to_text()
     lqname = qname.lower()
     labels = lqname.split(".")
+    suffix = ""
 
     # get qtype
     rrtype = m.question[0].rdtype