Restructure error handling in lead time charts

ee/app/assets/javascripts/dora/components/lead_time_charts.vue

@@ -55,28 +55,25 @@ export default {
   async mounted() {
     const results = await Promise.allSettled(
       allChartDefinitions.map(async ({ id, requestParams, startDate, endDate }) => {
-        let apiData;
         if (this.projectPath && this.groupPath) {
           throw new Error('Both projectPath and groupPath were provided');
-        } else if (this.projectPath) {
-          apiData = (
-            await DoraApi.getProjectDoraMetrics(
+        }
+
+        if (!this.projectPath && !this.groupPath) {
+          throw new Error('Either projectPath or groupPath must be provided');
+        }
+
+        const { data: apiData } = this.projectPath
+          ? await DoraApi.getProjectDoraMetrics(
               this.projectPath,
               DoraApi.LEAD_TIME_FOR_CHANGES,
               requestParams,
             )
-          ).data;
-        } else if (this.groupPath) {
-          apiData = (
-            await DoraApi.getGroupDoraMetrics(
+          : await DoraApi.getGroupDoraMetrics(
               this.groupPath,
               DoraApi.LEAD_TIME_FOR_CHANGES,
               requestParams,
-            )
-          ).data;
-        } else {
-          throw new Error('Either projectPath or groupPath must be provided');
-        }
+            );
 
         this.chartData[id] = buildNullSeriesForLeadTimeChart(
           apiDataToChartSeries(apiData, startDate, endDate, CHART_TITLE, null),