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ListContourPlot and missing data


I've a rectangular array containing numerical data as some entries, and
Null in other entries (which represent
the boundaries and solid regions of an irregularly shaped fluid flow domain.

For a rectangular domain (with no Nulls) 
I plot my scalar field data (temperature), with

  ListContourPlot[matrix,PlotRange->{Min[matrix],Max[matrix]},
          Contours->20, ColorFunction->(RGBColor[1-#,0,#] &)]

which shades the warm areas red, and the cold areas blue. Is there some way I
can plot the irregular data, with the Null elements coloured black.  

Obviously, the Nulls could easily be replaced by anything else.


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