ovs-dpctl-top: Skip "eth()" element.

With commit efde188 ("odp-util: Print eth() for Ethernet flows if
packet_type is absent.") "eth()" is printed for Ethernet flows if packet_type
is absent, but this broke "ovs-dpctl-top" since it expects that every
element has a value.

This commit skips the parsing of the empty "eth()" element.

Fixes: efde188 ("odp-util: Print eth() for Ethernet flows if packet_type is absent.")
Signed-off-by: Timothy Redaelli <tredaelli@redhat.com>
Acked-by: Flavio Leitner <fbl@sysclose.org>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>

utilities/ovs-dpctl-top.in

@@ -480,6 +480,8 @@ def elements_to_dict(elements):
     """ Convert line to a hierarchy of dictionaries. """
     result = {}
     for element in elements:
+        if (element == "eth()"):
+            continue
         match = FIELDS_CMPND.search(element)
         if (match):
             key = match.group(1)