[STORM-3132] Avoid NPE in the Values Constructor

[kishorvpatil]

Values construction could end up throwing NPE.

[revans2]

So this changes a Values(null) into a Values() That is not really what I would expect. I would prefer to have Values(null) insert a null into the list. Values(null, "A") does not turn into Values("A").

[HeartSaVioR]

+1 to @revans2.

[kishorvpatil]

@revans2 @HeartSaVioR Now constructor allows null values.

[kishorvpatil]

@HeartSaVioR Removed unwanted condition.