fix(table): renderes empty date column as '-' (#6736)

* fix(table): renderes empty date column as '-'

closes #6728

* docs(changelog): add note about closing 6728

CHANGELOG.md

@@ -8,6 +8,7 @@
 * **Alerts out of sync**: Saving dashboards with broken alerts causes sync problem[#6576](https://github.com/grafana/grafana/issues/6576)
 * **Alerts out of sync**: Saving dashboards with broken alerts causes sync problem[#6576](https://github.com/grafana/grafana/issues/6576)
 * **Alerting**: Saving an alert with condition "HAS NO DATA" throws an error[#6701](https://github.com/grafana/grafana/issues/6701)
 * **Alerting**: Saving an alert with condition "HAS NO DATA" throws an error[#6701](https://github.com/grafana/grafana/issues/6701)
 * **Config**: Improve error message when parsing broken config file [#6731](https://github.com/grafana/grafana/issues/6731)
 * **Config**: Improve error message when parsing broken config file [#6731](https://github.com/grafana/grafana/issues/6731)
+* **Table**: Render empty dates as - instead of current date [#6728](https://github.com/grafana/grafana/issues/6728)
 
 
 # 4.0-beta2 (2016-11-21)
 # 4.0-beta2 (2016-11-21)
 
 

public/app/plugins/panel/table/renderer.ts

@@ -47,6 +47,10 @@ export class TableRenderer {
 
 
     if (style.type === 'date') {
     if (style.type === 'date') {
       return v => {
       return v => {
+        if (v === undefined || v === null) {
+          return '-';
+        }
+
         if (_.isArray(v)) { v = v[0]; }
         if (_.isArray(v)) { v = v[0]; }
         var date = moment(v);
         var date = moment(v);
         if (this.isUtc) {
         if (this.isUtc) {

public/app/plugins/panel/table/specs/renderer_specs.ts

@@ -68,6 +68,16 @@ describe('when rendering table', () => {
       expect(html).to.be('<td>2014-01-01T06:06:06Z</td>');
       expect(html).to.be('<td>2014-01-01T06:06:06Z</td>');
     });
     });
 
 
+    it('undefined time column should be rendered as -', () => {
+      var html = renderer.renderCell(0, undefined);
+      expect(html).to.be('<td>-</td>');
+    });
+
+    it('null time column should be rendered as -', () => {
+      var html = renderer.renderCell(0, null);
+      expect(html).to.be('<td>-</td>');
+    });
+
     it('number column with unit specified should ignore style unit', () => {
     it('number column with unit specified should ignore style unit', () => {
       var html = renderer.renderCell(5, 1230);
       var html = renderer.renderCell(5, 1230);
       expect(html).to.be('<td>1.23 kbps</td>');
       expect(html).to.be('<td>1.23 kbps</td>');