Array value that hasn't been set?

I have an array built using AJAX and CSV2ARRAY plugin.

Example data:

Carrot, Juice

Banana

Apple, Sauce

Peanut

Lemon

Coconut, Chocolate

Row 0 has X and Y but Row 1 does not have a Y value.

0, 0 = "Carrot"

0, 1 = "Juice"

and

1, 0 = "Banana"

What is 1, 1?

Does

1, 1 = ""

Or

1, 1 = 0

?

I want to create an If/Else using the data...

If Current.Y != "" Then Create 2 small objects for text display evenly spaced.

Else Create 1 large object for text display centered.

If I have never assigned data to an Array cell should I use "" to check for an empty cell?

Thanks!

all unused arrays are set to 0