Correct CPE retrieval from XML

when multiple cpe are found by nmap the code was storing only the latest (which usually is the least relevant)

Author: dupouyleo

nmap3/nmapparser.py

@@ -173,11 +173,11 @@ def parse_ports(self, xml_hosts):
 
             if(port.find('service') is not None):
                 open_ports["service"]=port.find("service").attrib
-                
+                cpe_list = []
                 for cp in port.find("service").findall("cpe"):
-                    cpe_list = []
+                    
                     cpe_list.append({"cpe": cp.text})
-                    open_ports["cpe"] = cpe_list
+                open_ports["cpe"] = cpe_list
 
             # Script
             open_ports["scripts"]=self.parse_scripts(port.findall('script')) if port.findall('script') is not None else []