Using timechart to get count, why is returning null values as 0?

[csquared]

Already using a query with below to get total number:

| timechart span=1d count

What can I add to return, show a "0" if the query is null?

[sperkins]

| timechart span=1d count
| fullnull

[ITWhisperer]

| appendpipe
[ stats count as _events
| where _events = 0
| eval count = 0]