Use destruturing assignment to format the formula result

lib/cartodb/models/dataview/formula.js

@@ -103,23 +103,20 @@ module.exports = class Formula extends BaseDataview {
     }
 
     format (result) {
-        var formattedResult = {
+        const {
+            result = 0,
+            nulls_count = 0,
+            nans_count = 0,
+            infinities_count = 0
+        } = result.rows[0] || {};
+
+        return {
             operation: this.operation,
-            result: 0,
+            result,
-            nulls: 0,
+            nulls: nulls_count,
-            nans: 0,
+            nans: nans_count,
-            infinities: 0
+            infinities: infinities_count
         };
-
-        if (result.rows.length) {
-            formattedResult.operation = this.operation;
-            formattedResult.result = result.rows[0].result;
-            formattedResult.nulls = result.rows[0].nulls_count;
-            formattedResult.nans = result.rows[0].nans_count;
-            formattedResult.infinities = result.rows[0].infinities_count;
-        }
-
-        return formattedResult;
     }
 
     getType () {