jsapi: fix null check for optional color param

[nbauernfeind]

This just fixes some whining when an optional parameter is not specified.

[mattrunyon]

I get the same error on the docs example with this fix

I think the issue Colin and I found originally was the tables get bound in a different order or 1 table gets bound as both.

We set a breakpoint and inspected and saw that table 0 was table 1 and table 1 was table 0, or table 0 was both table 0 and table 1 (I don't remember which, but I think it was swapped). This caused the issue with findColumn because the column name is from table 1, but looking up on table 0.

[mattrunyon]

Still getting the error. I think it is more in depth and has to do with using a HashSet or HashMap and losing order somewhere

[niloc132]

Agreed, I don't see how this can fix the issue at hand (though it is likely a bug in and of itself).