[CDF-380] - CCC - HeatGrid - A null size value and a non-null color value no longer show a colored null symbol (cross) instead.
* Another refactoring that went wrong, by changing the order of execution of something to after it was needed.
Merge pull request #131 from dcleao/CDF-380

[CDF-380] - CCC - HeatGrid - A null size value and a non-null color valu...