Allow null parents from Google Tasks

app/src/main/java/org/tasks/data/GoogleTaskDao.kt

@@ -131,7 +131,7 @@ abstract class GoogleTaskDao {
     abstract suspend fun updateParents(listId: String)
 
     @Query("UPDATE google_tasks SET gt_remote_parent = :parent, gt_remote_order = :position WHERE gt_remote_id = :id")
-    abstract suspend fun updatePosition(id: String, parent: String, position: String)
+    abstract suspend fun updatePosition(id: String, parent: String?, position: String)
 
     @Transaction
     open suspend fun reposition(listId: String) {

app/src/main/java/org/tasks/data/GoogleTaskDaoBlocking.kt

@@ -103,7 +103,7 @@ class GoogleTaskDaoBlocking @Inject constructor(private val dao: GoogleTaskDao)
         dao.updateParents(listId)
     }
 
-    fun updatePosition(id: String, parent: String, position: String) = runBlocking {
+    fun updatePosition(id: String, parent: String?, position: String) = runBlocking {
         dao.updatePosition(id, parent, position)
     }