I am learning PL/SQL these days and currently working with Procedures and exceptions using oracle HR schema.
Here is my simple procedure.
create or rep
There is no "exception" - the sql executed successfully. It successfully deleted every record that matched the criteria...which was 0 records. Same thing if a similar update statement was executed. You used the SQL%NOTFOUND to determine there were no records that were affected, but this does not mean there was an "exception".
Perhaps you're thinking of the NO_DATA_FOUND Exception raised if you try a "select into" clause and it doesn't find any matching records.