Some say yes, some say no. I don't have enough experience to know for sure. I would seal it up as tight as possible just to be safe.
A light leak shouldn't hurt a plant with stable genetics. Since it's not completely dark outside at night. Otherwise every plant grown outside would be. If the genetics of the plant has hermie tendencies it probably wouldn't take much light to cause problems.
Take it out of the room to aviod it spreading. Then pinch one. What came out?
nothing. Is something suppose to come out?
Kill that cross dress'n freak!