Fix for /etc/hosts parsing

Author: arlake228

psconfig/perfsonar-psconfig/psconfig/utilities/dns.py

@@ -14,6 +14,8 @@ def read_etc_hosts():
         with open('/etc/hosts', 'r') as file:
             for line in file:
                 entry = line.split()
+                if not entry or len(entry) < 2:
+                    continue
                 ip_hosts[entry[0]] = entry[1:]
                 for host in entry[1:]:
                     host_ips[host] = host_ips.get(host, []) + [entry[0]]