Sanity checks to prevent null pointer exceptions in sync service

astrid/plugin-src/com/todoroo/astrid/actfm/sync/ActFmSyncService.java

@@ -412,6 +412,7 @@ public final class ActFmSyncService {
      */
     public void pushTask(long taskId) {
         Task task = taskService.fetchById(taskId, Task.PROPERTIES);
+        if (task != null)
             pushTaskOnSave(task, task.getMergedValues());
     }
 
@@ -421,6 +422,7 @@ public final class ActFmSyncService {
      */
     public void pushTag(long tagId) {
         TagData tagData = tagDataService.fetchById(tagId, TagData.PROPERTIES);
+        if (tagData != null)
             pushTagDataOnSave(tagData, tagData.getMergedValues());
     }
 
@@ -430,6 +432,7 @@ public final class ActFmSyncService {
      */
     public void pushUpdate(long updateId) {
         Update update = updateDao.fetch(updateId, Update.PROPERTIES);
+        if (update != null)
             pushUpdateOnSave(update, update.getMergedValues(), null);
     }