Don't crash EteSync sync on iCal parse failure

app/src/main/java/org/tasks/caldav/iCalendar.kt

@@ -46,8 +46,15 @@ class iCalendar @Inject constructor(
         }
 
         fun fromVtodo(vtodo: String): Task? {
+            try {
                 val tasks = tasksFromReader(StringReader(vtodo))
-            return if (tasks.size == 1) tasks[0] else null
+                if (tasks.size == 1) {
+                    return tasks[0]
+                }
+            } catch (e: Exception) {
+                Timber.e(e)
+            }
+            return null
         }
 
         fun getParent(remote: Task): String? {

app/src/main/java/org/tasks/etesync/EteSynchronizer.java

@@ -237,6 +237,9 @@ public class EteSynchronizer {
       String vtodo = syncEntry.getContent();
       Timber.v("%s: %s", action, vtodo);
       at.bitfire.ical4android.Task task = iCalendar.Companion.fromVtodo(vtodo);
+      if (task == null) {
+        continue;
+      }
       String remoteId = task.getUid();
       CaldavTask caldavTask = caldavDao.getTaskByRemoteId(caldavCalendar.getUuid(), remoteId);
       switch (action) {