How to return rows where count = 0

Hi, I have the below query that returns the quarters along with the number of issues:
select MQTR as Quarter, count(MQTR)
from tbl1, tbl2
where Fdate=Cdate
and cycle_missed = 'Yes'
group by MQTR
order by 1
output:
2006-Q2      1
2006-Q3      1
2007-Q2      2
I know that 2007-Q1 has 0 issues but I can't get the query to return the row with count 0. So my question is how I can get this output:
2006-Q2      1
2006-Q3      1
2007-Q1      0
2007-Q2      2

SQL> create table tbl1
2 as
3 select date '2006-04-10' cdate, '2006-Q3' mqtr from dual union all
4 select date '2006-08-11', '2006-Q4' from dual union all
5 select date '2006-10-12', '2007-Q1' from dual union all
6 select date '2007-02-13', '2007-Q2' from dual
7 /
Tabel is aangemaakt.
SQL> create table tbl2
2 as
3 select date '2006-04-10' run_date, 'Yes' interventions from dual union all
4 select date '2006-04-15', 'Yes' from dual union all
5 select date '2006-08-19', 'No' from dual union all
6 select date '2006-10-20', 'Yes' from dual union all
7 select date '2006-12-20', 'No' from dual union all
8 select date '2007-02-20', 'No' from dual
9 /
Tabel is aangemaakt.
SQL> select tbl1.mqtr
2       , count(tbl2.run_date) "Count"
3    from tbl1
4       , tbl2
5   where tbl1.mqtr = to_char(add_months(tbl2.run_date (+),3),'yyyy-"Q"q')
6     and tbl2.interventions (+) = 'Yes'
7   group by mqtr
8   order by mqtr
9 /
MQTR         Count
2006-Q3          2
2006-Q4          0
2007-Q1          1
2007-Q2          0
4 rijen zijn geselecteerd.Regards,
Rob.

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