fixing some crashes with naive try/catch blocks

app/src/main/kotlin/com/simplemobiletools/calendar/pro/helpers/CalDAVHelper.kt

@@ -145,7 +145,12 @@ class CalDAVHelper(val context: Context) {
     private fun fetchCalDAVCalendarEvents(calendarId: Int, eventTypeId: Long, showToasts: Boolean) {
         val importIdsMap = HashMap<String, Event>()
         val fetchedEventIds = ArrayList<String>()
-        val existingEvents = context.eventsDB.getEventsFromCalDAVCalendar("$CALDAV-$calendarId")
+        val existingEvents = try {
+            context.eventsDB.getEventsFromCalDAVCalendar("$CALDAV-$calendarId")
+        } catch (e: Exception) {
+            ArrayList()
+        }
+
         existingEvents.forEach {
             importIdsMap[it.importId] = it
         }

app/src/main/kotlin/com/simplemobiletools/calendar/pro/helpers/Converters.kt

@@ -16,7 +16,11 @@ class Converters {
             value
         }
 
-        return gson.fromJson(newValue, stringType)
+        return try {
+            gson.fromJson(newValue, stringType)
+        } catch (e: Exception) {
+            ArrayList()
+        }
     }
 
     @TypeConverter

app/src/main/kotlin/com/simplemobiletools/calendar/pro/helpers/EventsHelper.kt

@@ -248,7 +248,11 @@ class EventsHelper(val context: Context) {
                 callback(ArrayList())
                 return
             } else {
-                eventsDB.getOneTimeEventsFromToWithTypes(toTS, fromTS, context.config.getDisplayEventTypessAsList()).toMutableList() as ArrayList<Event>
+                try {
+                    eventsDB.getOneTimeEventsFromToWithTypes(toTS, fromTS, context.config.getDisplayEventTypessAsList()).toMutableList() as ArrayList<Event>
+                } catch (e: Exception) {
+                    ArrayList()
+                }
             }
         } else {
             if (eventId == -1L) {

app/src/main/kotlin/com/simplemobiletools/calendar/pro/models/Event.kt

@@ -86,7 +86,11 @@ data class Event(
 
         while (newDateTime.dayOfMonth().maximumValue < Formatter.getDateTimeFromTS(original.startTS).dayOfMonth().maximumValue) {
             newDateTime = newDateTime.plusMonths(repeatInterval / MONTH)
-            newDateTime = newDateTime.withDayOfMonth(currStart.dayOfMonth)
+            newDateTime = try {
+                newDateTime.withDayOfMonth(currStart.dayOfMonth)
+            } catch (e: Exception) {
+                newDateTime
+            }
         }
         return newDateTime
     }