Add values to a PL/SQL cursor

Question

Good night. I am trying to define the values of a cursor in PL/SQL, however one of the values is never filled. In this case, the qtd_daysSummary number never has content, however all others do, which I assume is because I’m using a different select for qtd_daysSummary. When testing code using anonymous blocks, all values are correct, except this one is empty.

CREATE OR REPLACE FUNCTION fncObterRegistoMensalCamareira(mes int, ano int DEFAULT (EXTRACT (year from SYSDATE()) - 1)) return SYS_REFCURSOR AS

idCamareira camareira.id%type;
nomeCamareira funcionario.nome%type;
valorTotal_consumos number;
dataPrimeiroConsumo date;
dataUltimoConsumo date;
qtd_diasSemConsumo number;

cursorConsumos SYS_REFCURSOR;

BEGIN
    
    OPEN cursorConsumos 
    
    
    FOR SELECT cam.id, func.nome, sum(linha.preco_unitario) as Valor_Total, 
    min(linha.data_registo) as DATA_PRIMEIRO_REGISTO,
    max(linha.data_registo) as DATA_ULTIMO_REGISTO
    FROM camareira cam, funcionario func, linha_conta_consumo linha
    WHERE cam.id = func.id AND EXTRACT (month FROM linha.data_registo) = mes AND EXTRACT (year FROM linha.data_registo) = ano
    AND cam.id = linha.id_camareira
    GROUP BY cam.id, func.nome, linha.quantidade;
    
    
    SELECT COUNT(*) INTO qtd_diasSemConsumo
    FROM (select to_date('01-02-2020' ,'dd-mm-yyyy')+level-1
     from dual 
     connect by level <= TO_CHAR(LAST_DAY(to_date('01-02-2020' ,'dd-mm-yyyy')),'DD')
     MINUS
     SELECT DISTINCT linhaC.data_registo
    FROM camareira cama, linha_conta_consumo linhaC
    WHERE cama.id = linhaC.id_camareira AND EXTRACT(month FROM linhaC.data_registo) = mes AND cama.id = idCamareira);

RETURN cursorConsumos;
EXCEPTION
  when no_data_found then
  return null;
END;