Entering Dates In Blank Rows

I'm hoping that someone can help. This is my first time posting and fortunately I can normally find what I need but this time I am stumped.

I have a query that produces a date range. The problem is I want to insert or at lease display the dates between even if they don't show up in table. Here's the problem.

My intial query is
select date_of_call
from call_data
where date_of_call >= '2001-09-01' and date_of_call <= '2001-09-15'
order by date_of_call

Results:
2001-09-03 00:00:00.000
2001-09-07 00:00:00.000
2001-09-10 00:00:00.000
2001-09-13 00:00:00.000
2001-09-13 00:00:00.000
2001-09-13 00:00:00.000
2001-09-13 00:00:00.000
2001-09-13 00:00:00.000
2001-09-14 00:00:00.000

When I do a group by and count it looks like this:
select date_of_call, count(date_of_call) as Count_Date_of_Call
from call_data
where date_of_call >= '2001-09-01' and date_of_call <= '2001-09-15'
group by date_of_call
order by date_of_call

Date_Of_Call, Count_Date_of_Call
2001-09-03 00:00:00.0001
2001-09-07 00:00:00.0001
2001-09-10 00:00:00.0001
2001-09-13 00:00:00.0005
2001-09-14 00:00:00.0001

If you notice out of 15 days it only shows 5 days. I am wondering how I can insert the days missing and insert either null or 0 values in the count column so it would look something like this:

Date_Of_Call, Count_Date_of_Call
2001-09-01 00:00:00.0000
2001-09-02 00:00:00.0000
2001-09-03 00:00:00.0001
2001-09-04 00:00:00.0000
2001-09-05 00:00:00.0000
2001-09-06 00:00:00.0000
2001-09-07 00:00:00.0001
2001-09-08 00:00:00.0000
2001-09-09 00:00:00.0000
2001-09-10 00:00:00.0001
2001-09-11 00:00:00.0000
2001-09-12 00:00:00.0000
2001-09-13 00:00:00.0005
2001-09-14 00:00:00.0001
2001-09-15 00:00:00.0000

Any help would be much appreciates.