feat: improve activity metrics filtering to handle undefined and zero values in HighchartsService

Author: MattG57

frontend/src/app/services/highcharts.service.ts

@@ -584,8 +584,7 @@ export class HighchartsService {
     Object.entries(activity).forEach(([date, dateData]) => {
       // Skip if totalActive is undefined or 0
       const currentMetrics = metrics.find(m => m.date.startsWith(date.slice(0, 10)));
-      if (currentMetrics?.copilot_ide_code_completions?.total_engaged_users || 0 > 0) return;
-      
+      if (!currentMetrics || (currentMetrics.copilot_ide_code_completions?.total_engaged_users ?? 0) < 1) return;
 
       if (currentMetrics?.copilot_ide_code_completions) {
         (dailyActiveIdeCompletionsSeries.data).push({