Sheriff-o-matic: Fix inverted condition when persisting annotations

Tools/GardeningServer/model/ct-failure-group.html

Index: Tools/GardeningServer/model/ct-failure-group.html
diff --git a/Tools/GardeningServer/model/ct-failure-group.html b/Tools/GardeningServer/model/ct-failure-group.html
index 723165866db724a63d327452e9e43c0a487f2dce..84d01dc9177f9b3b34157482aece5da39e030ff7 100644
--- a/Tools/GardeningServer/model/ct-failure-group.html
+++ b/Tools/GardeningServer/model/ct-failure-group.html
@@ -42,9 +42,9 @@ CTFailureGroup.prototype._annotate = function(newAnnotation) {
     });
 
     if (Object.size(annotation) == 0) {
-      annotations[this.key] = annotation;
-    } else {
       delete annotations[this.key];
+    } else {
+      annotations[this.key] = annotation;
     }
 
     localStorage.CTFailureGroupAnnotations = JSON.stringify(annotations);