Bug with apache graph in trends

I've done some tests to get apache statistics graph in the trends
column. I use the "0.0.0.0 hostname" format in the bb-hosts file so that
i can solve the address with dns and hosts file.
In this situation i don't get the apache graph.
Doing  a bbcmd bbtest-net --debug hostname i get those lines in the
output of the command and i don't get the graph

URL                      : http://0.0.0.0/server-status?auto
HTTP status              : 0
HTTP headers
(NULL)
HTTP output
(NULL) 

If i put the correct ip address in the bb-hosts file i get the graph and
the status page in the debug output

Hoping this can help.
Francesco Duranti