Checked resId > 0; 0 is null

My bad on design to marc

Change-Id: I9a5387464f719a75b56186576340c5aef20798d3
diff --git a/src/com/android/mail/providers/Folder.java b/src/com/android/mail/providers/Folder.java
index 03a0253..448b0e7 100644
--- a/src/com/android/mail/providers/Folder.java
+++ b/src/com/android/mail/providers/Folder.java
@@ -441,7 +441,7 @@
     public static void setFolderBlockColor(Folder folder, View colorBlock) {
         final boolean showBg = !TextUtils.isEmpty(folder.bgColor);
         final int backgroundColor = showBg ? Integer.parseInt(folder.bgColor) : 0;
-        if (folder.iconResId >= 0) {
+        if (folder.iconResId > 0) {
             colorBlock.setBackgroundResource((int)folder.iconResId);
         } else if (!showBg) {
             colorBlock.setBackgroundDrawable(null);