[flexcoders] Cannot access a property or method of a null object reference

[napearson99]

I often get this error and I "usually" know why.  Does anyone know how
to check for a null reference?

i.e.

if (dataprovider[i].someValue is null){
 dothis();
}

Where dataprovider[i] does not have a someValue property.  I bet this
is pretty simple and I just don't know the syntax.  Thanks in advance!