Output Sdo configuration header even if no Sdos were configured.
/* $Id$ */
digraph pdoconfig {
size="7,9"
center=1
ratio=fill
next_pdo [shape=point,label=""]
start -> next_pdo [label="First Pdo"]
next_pdo -> end [label="No more Pdos"]
next_pdo -> zero_count [label="Next Pdo"]
zero_count -> next_pdo [label="No Entries"]
zero_count -> add_entry [label="Add first entry", weight=5]
add_entry -> add_entry [label="Add next entry"]
add_entry -> entry_count [label="No more Entries", weight=5]
entry_count -> next_pdo
}