[Settings] Fix divide by zero in data usage UI

Data usage UI got divide by zero exception when zero data usage.

Bug: 182822862
Test: local
Change-Id: Ibe57034e7d441e94c0529cb76f1a16665aaacff6

src/com/android/settings/datausage/ChartDataUsagePreference.java

@@ -174,8 +174,8 @@ public class ChartDataUsagePreference extends Preference {
     @VisibleForTesting
     List<DataUsageSummaryNode> getDensedStatsData(List<NetworkCycleData> usageSummary) {
         final List<DataUsageSummaryNode> dataUsageSummaryNodes = new ArrayList<>();
-        final long overallDataUsage = usageSummary.stream()
-                .mapToLong(NetworkCycleData::getTotalUsage).sum();
+        final long overallDataUsage = Math.max(1L, usageSummary.stream()
+                .mapToLong(NetworkCycleData::getTotalUsage).sum());
         long cumulatedDataUsage = 0L;
         int cumulatedDataUsagePercentage = 0;