Initialize accessLevel with CAL_ACCESS_NONE if not present

Author: rfc2822

lib/src/main/kotlin/at/bitfire/ical4android/AndroidCalendar.kt

@@ -165,7 +165,7 @@ class AndroidCalendar<out T : AndroidEvent>(
 
     var name: String? = null
     var displayName: String? = null
-    var accessLevel: Int? = null
+    var accessLevel: Int = Calendars.CAL_ACCESS_NONE
     var color: Int? = null
     var isSynced = true
     var isVisible = true
@@ -188,7 +188,7 @@ class AndroidCalendar<out T : AndroidEvent>(
     private fun populate(info: ContentValues) {
         name = info.getAsString(Calendars.NAME)
         displayName = info.getAsString(Calendars.CALENDAR_DISPLAY_NAME)
-        accessLevel = info.getAsInteger(Calendars.CALENDAR_ACCESS_LEVEL)
+        accessLevel = info.getAsInteger(Calendars.CALENDAR_ACCESS_LEVEL) ?: Calendars.CAL_ACCESS_NONE
 
         color = info.getAsInteger(Calendars.CALENDAR_COLOR)