oracle - Type table null value check -


i have type of following in plsql block 

 type table_type table of varchar2(200);  v_tab_1  table_type;

values initialized 

if (prod_amnt > inv_amnt)               v_tab_1 := table_type(prod_amnt, 'curr'); ......

sometimes above condition not true , there null values in v_tab_1

what best approach check values exist in v_tab_1?

i have tried 

 if not(v_tab_1.exists(v_tab_1.first))

however above resulted in no_data_found exception

how deal this?

force single error value table type? , check value.

if (prod_amnt > inv_amnt)               v_tab_1 := table_type(prod_amnt, 'curr');  else   v_tab_1 := table_type(0, 'err');  end if;

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