Avoid showing "0 minute" in the charge time label

Remove the charge to full time label if its value is invalid
https://screenshot.googleplex.com/5psbvFpcm2CFdRB

Test: make test RunSettingsRoboTests ROBOTEST_FILTER=com.android.settings.fuelgauge.*
Fix: 278740808
Change-Id: I765cdcdee8525adb2583d5950bc646c604c744de
diff --git a/src/com/android/settings/fuelgauge/BatteryInfo.java b/src/com/android/settings/fuelgauge/BatteryInfo.java
index d164e93..9824044 100644
--- a/src/com/android/settings/fuelgauge/BatteryInfo.java
+++ b/src/com/android/settings/fuelgauge/BatteryInfo.java
@@ -299,9 +299,10 @@
                     (double) PowerUtil.convertUsToMs(info.remainingTimeUs), false /* withSeconds */,
                     true /* collapseTimeUnit */);
             int resId = R.string.power_charging_duration;
-            info.remainingLabel = context.getString(R.string.power_remaining_charging_duration_only,
-                    timeString);
-            info.chargeLabel = context.getString(resId, info.batteryPercentString, timeString);
+            info.remainingLabel = chargeTimeMs <= 0 ? null : context.getString(
+                    R.string.power_remaining_charging_duration_only, timeString);
+            info.chargeLabel = chargeTimeMs <= 0 ? info.batteryPercentString
+                    : context.getString(resId, info.batteryPercentString, timeString);
         } else if (dockDefenderMode == BatteryUtils.DockDefenderMode.FUTURE_BYPASS) {
             // Dock defender will be triggered in the future, charging will be optimized.
             info.chargeLabel = context.getString(R.string.power_charging_future_paused,