fix: Validation for negative responses

tools.py

@@ -167,7 +167,7 @@ def validate_dnssec(domain):
     # delv @194.50.5.28 -a hsd-ksk nathan.woodburn A +rtrace +vtrace
     command = f"delv @{resolverIP} -a hsd-ksk {domain} A +rtrace +vtrace"
     result = subprocess.run(command, shell=True, capture_output=True, text=True)
-    if "; fully validated" in result.stdout:
+    if "; fully validated" in result.stdout or "; negative response, fully validated" in result.stdout:
         return {"valid": True, "message": "DNSSEC is valid", "output": result.stderr + result.stdout}
     else:
         return {"valid": False, "message": "DNSSEC is not valid", "output": result.stderr + result.stdout}