Improved PalmDetector stability.

bbiwarg/Detectors/Palm/PalmDetector.cs

@@ -60,9 +60,12 @@ namespace bbiwarg.Detectors.Palm
                 removePointsFromContour(wristLine, 1);
                 removePointsFromContour(thumbLine, 1);
 
-                findPalmRect();
+                if (palmContour.Count<Point>() != 0)
+                {
+                    findPalmRect();
 
-                draw();
+                    draw();
+                }
             }
         }