Applied patches from Dan Miller to fix bugs in http and sslcert libraries;

http://seclists.org/nmap-dev/2012/q2/696

nselib/http.lua

@@ -1334,6 +1334,9 @@ local function parse_redirect(host, port, path, response)
     u.host, u.port = stdnse.get_hostname(host), port.number
     u.path = ((u.path:sub(1,1) == "/" and "" ) or "/" ) .. u.path -- ensuring leading slash
   end
+  if ( not(u.path) ) then
+    u.path = "/"
+  end
   if ( u.query ) then
     u.path = ("%s?%s"):format( u.path, u.query )
   end

nselib/sslcert.lua

@@ -200,6 +200,9 @@ function getCertificate(host, port)
 		end
     end 
     local cert = socket:get_ssl_certificate()
+	if ( cert == nil ) then
+		return false, "Unable to get cert"
+	end
 	
 	host.registry["ssl-cert"] = host.registry["ssl-cert"] or {}
 	host.registry["ssl-cert"][port.number] = host.registry["ssl-cert"][port.number] or {}