From 2de4c582131a9424f8d18d22c5a55f07b1fdea1b Mon Sep 17 00:00:00 2001
From: Gilberto Stankiewicz <kiewic@gmail.com>
Date: Sat, 15 Jul 2017 15:03:10 -0700
Subject: [PATCH] Fix: Category columns can have blank values (#7, #4)

---
 waffleChart/pbiviz.json   | 2 +-
 waffleChart/src/visual.ts | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/waffleChart/pbiviz.json b/waffleChart/pbiviz.json
index 787edb6..aa2b538 100644
--- a/waffleChart/pbiviz.json
+++ b/waffleChart/pbiviz.json
@@ -4,7 +4,7 @@
     "displayName": "Waffle Chart",
     "guid": "WaffleChart1453776852267",
     "visualClassName": "Visual",
-    "version": "2.0.6",
+    "version": "2.0.7",
     "description": "A Waffle Chart uses a 10x10 grid of dots to visually show a percentage value. Each dot represents one percentage point, so a block of 43 highlighted dots would represent 43%. Multiple Waffle Charts can be used to visually compare multiple percentage values.",
     "supportUrl": "https://github.com/kiewic/PowerBI-WaffleChart",
     "gitHubUrl": "https://github.com/kiewic/PowerBI-WaffleChart"
diff --git a/waffleChart/src/visual.ts b/waffleChart/src/visual.ts
index c77df15..9c112f3 100644
--- a/waffleChart/src/visual.ts
+++ b/waffleChart/src/visual.ts
@@ -183,7 +183,7 @@ module powerbi.extensibility.visual {
             }
         }
 
-        private static formatCategoryValue(value: PrimitiveValue, type: ValueTypeDescriptor): string {
+        private static formatCategoryValue(value: PrimitiveValue | null, type: ValueTypeDescriptor): string {
             if (type.dateTime)
             {
                 let formatter : IValueFormatter;
@@ -197,7 +197,7 @@ module powerbi.extensibility.visual {
                 return formatter.format(value);
             }
 
-            return value.toString();
+            return value && value.toString();
         }
 
         public static converter(dataView: DataView): WaffleChartViewModel {