Illustrator Scripting :: Any Way To Select TextFrames That Only Have A Fill Color

I have a script that will select text Frames, but I have come into a situation where I need to exclude any text frames that do not have a fill color. I do not see a filled Boolean property for character attributes or text Frames. 
 
This is what I used to select all text on all visible and unlocked layers. I dont see a way to exclude textframes that have no fillcolor.
 
if (app.documents.length > 0 ) { 
var doc = app.activeDocument;   
var numTextFrames = 0;   
for (  i = 0; i < doc.textFrames.length; i++ ) {
try { 
textArtRange = doc.textFrames[i];
textArtRange.selected = true;
} catch (e) {}        }    }