excel: remove number from plot, set no number in formula -

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i have log formular prints out errors values below 0. set these 0 in formula, want have no number, not 0 inserted. how set cell/formula no number?

this current formula

=wenn(b2>0;log10(b2);)

the solution following

=if(b2>0;log10(b2);nv())

here explanation: http://office.microsoft.com/de-de/excel-help/nv-funktion-ha102752925.aspx, not find out how according english site.


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