fixbug seller.label_c

@@ -80,7 +80,7 @@ Component({
         } else {
           seller.distanceStr = seller.distance + 'm';
         }
-        if (seller.label_c.length > 0) {
+        if (seller.label_c && seller.label_c.length > 0) {
           let label_cstr = [];
           seller.label_c.forEach(l => {
             label_cstr.push(l.name)