Merge branch 'fix-division-by-zero-newsletter-comparison' into 'dev'

fix: division by zero in newsletter comparison

See merge request !910

src/services/consumption.service.ts

@@ -247,8 +247,8 @@ export default class ConsumptionDataManager {
   private calculatePerformanceIndicatorVariationPercentage(
     dataSum: number,
     comparisonDataSum: number
-  ): number {
-    return dataSum / comparisonDataSum - 1
+  ): number | null {
+    return comparisonDataSum !== 0 ? dataSum / comparisonDataSum - 1 : null
   }
 
   private async fetchSingleFluidGraphData(