SQL & PL/SQL :: Left Join With Fixed String Failed?

I have the following 2 SQLs ; one return 1 row, another one is no row returned.

select v.value
from v$parameter v
where v.name = 'cpu_count';

return value "1"

select o.value
from v$osstat o
where o.stat_name = 'NUM_CPU_CORES';

No row returned.

combine the above two in to 1 SQL, and return 1 , null or 1, 1. I assume we can get it with left join for the condition "o.stat_name (+) = 'NUM_CPU_CORES'" , but no row returned for the following SQL. How could we get the result for 1, null for this case?

select v.value, o.value -- or NVL(o.value, 1)
from v$parameter v, v$osstat o
where v.name = 'cpu_count'
and o.stat_name (+) = 'NUM_CPU_CORES';

no row returned