Added checks to ensure null values are not set as properties, which causes JDK 1.4 serialization to blow up (JDK 1.5+ handles null values without a problem)
Added checks to ensure null values are not set as properties, which causes JDK 1.4 serialization to blow up (JDK 1.5+ handles null values without a problem)

rjainqb/jets3t-rj,rjainqb/jets3t-rj