Make check really better

modules/exploits/multi/http/cisco_dcnm_upload.rb

@@ -98,6 +98,8 @@ class Metasploit3 < Msf::Exploit::Remote
     elsif res.code == 200 and
         res.body.to_s =~ /Data Center Network Manager/
       return Exploit::CheckCode::Detected
+    else
+      return Exploit::CheckCode::Safe
     end
 
     if version =~ /6.1/