lims_interface: Position new record based on order

https://bugs.tryton.org/issue8880

lims_interface/data.py

@@ -459,11 +459,14 @@ class Data(ModelSQL, ModelView):
         for oexpr, otype in order:
             fname, _, extra_expr = oexpr.partition('.')
             field = cls._fields[fname]
-            otype = otype.upper()
-            try:
-                otype, null_ordering = otype.split(' ', 1)
-            except ValueError:
-                null_ordering = None
+            if not otype:
+                otype, null_ordering = 'ASC', None
+            else:
+                otype = otype.upper()
+                try:
+                    otype, null_ordering = otype.split(' ', 1)
+                except ValueError:
+                    null_ordering = None
             Order = order_types[otype]
             NullOrdering = null_ordering_types[null_ordering]
             forder = field.convert_order(oexpr, tables, cls)