fix: power source crash (#1494)

Author: CloudyPadmal

app/src/main/java/io/pslab/activity/PowerSourceActivity.java

@@ -640,7 +640,11 @@ private int mapPowerToProgress(float power, int CONTROLLER_MAX, float max, float
      * @return truncated float value
      */
     private float limitDigits(float number) {
-        return Float.valueOf(String.format(Locale.getDefault(), "%.2f", number));
+        try {
+            return Float.valueOf(String.format(Locale.getDefault(), "%.2f", number));
+        } catch (NumberFormatException e) {
+            return 0.00f;
+        }
     }
 
     /**