Remove HabitNotFound exception from WidgetPreferences

android/uhabits-core/src/main/java/org/isoron/uhabits/core/preferences/Preferences.java

@@ -390,9 +390,11 @@ public class Preferences
             putString(key, StringUtils.joinLongs(values));
         }
 
-        default long[] getLongArray(String key)
+        default long[] getLongArray(String key, long[] defValue)
         {
-            return StringUtils.splitLongs(getString(key, ""));
+            String string = getString(key, "");
+            if (string.isEmpty()) return defValue;
+            else return StringUtils.splitLongs(string);
         }
     }
 }

android/uhabits-core/src/main/java/org/isoron/uhabits/core/preferences/WidgetPreferences.java

@@ -38,10 +38,10 @@ public class WidgetPreferences {
     }
 
     public long[] getHabitIdsFromWidgetId(int widgetId) {
-        long habitIds[];
+        long[] habitIds;
         String habitIdKey = getHabitIdKey(widgetId);
         try {
-            habitIds = storage.getLongArray(habitIdKey);
+            habitIds = storage.getLongArray(habitIdKey, new long[]{-1});
         } catch (ClassCastException e) {
             // Up to Loop 1.7.11, this preference was not an array, but a single
             // long. Trying to read the old preference causes a cast exception.
@@ -49,7 +49,6 @@ public class WidgetPreferences {
             habitIds[0] = storage.getLong(habitIdKey, -1);
             storage.putLongArray(habitIdKey, habitIds);
         }
-        if (habitIds.length == 0) throw new HabitNotFoundException();
         return habitIds;
     }