Product of empty cell

This seems too be so basic but i can't see how to solve it.
If have a formula such as =PRODUCT(B4,2) and cell B4 is empty I would expect the answer to be displayed as "0" but instead I get "2"!
What I am I doing wrong?

You are right.
The help claims:
PRODUCT
+The PRODUCT function calculates the product of the numbers in the arguments.+
+PRODUCT(number, [number, . . .])+
+number: One or more numbers or numeric expressions, or references to cells containing numbers or numeric expressions.+
Notes
+_Empty cells in a range are ignored and do not affect the result._+
I feel that this is surprising but as the function behaves as it is described, it's a feature not a bug.
No problem, I will post an addition to my report. More than 50 other ones are always alive
Yvan KOENIG (from FRANCE mercredi 20 août 2008 20:59:04)

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</div>
Hello
The best way I found to solve your problem is:
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Which reads:
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Of course, if the sum is nil the displayed [thanks you Barry ;-)] value will be a zero.
Maybe it's what schubladenschrank was offering but I don't read Deutsch.
Just for info, your formula may be shorten as:
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Yvan KOENIG (from FRANCE samedi 2 février 2008 13:55:43)

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