Check study instances whether they have image data based on sopClassUid instead of rows

Packages/viewerbase/lib/createStacks.js

@@ -22,9 +22,9 @@ createStacks = function(study) {
         }
 
         // Don't display thumbnails for non-image modalities
-        // All imaging modalities must have a valid value for rows (or columns)
+        // All imaging modalities must have a valid value for sopClassUid
         var anInstance = series.instances[0];
-        if (!anInstance || !anInstance.rows) {
+        if (!anInstance || !isImage(anInstance.sopClassUid)) {
             return;
         }