No data -> NO_DATA

src/panel/graph_panel/models/threshold.ts

@@ -6,7 +6,7 @@ export enum Condition {
   EQUAL = '=',
   LESS_OR_EQUAL = '<=',
   LESS = '<',
-  NO_DATA = 'No data'
+  NO_DATA = 'NO_DATA'
 };
 
 export type Threshold = {

src/panel/graph_panel/partials/tab_analytics.html

@@ -75,7 +75,10 @@
         class="gf-form-input width-5"
         type="number"
         ng-model="ctrl.analyticsController.getThreshold(analyticUnit.id).value"
-        ng-if="analyticUnit.detectorType === 'threshold' && ctrl.analyticsController.getThreshold(analyticUnit.id).condition != 'No data'"
+        ng-if="
+          analyticUnit.detectorType === 'threshold' &&
+          ctrl.analyticsController.getThreshold(analyticUnit.id).condition != 'NO_DATA'
+        "
         ng-blur="ctrl.analyticsController.saveThreshold(analyticUnit.id)"
       />