diff --git a/singletree.py b/singletree.py
index e4d0660..33a9ac6 100644
--- a/singletree.py
+++ b/singletree.py
@@ -55,8 +55,11 @@ ui_tmpl = """
 		"parentField":"{{parentField}}",
 		"idField":"{{idField}}",
 		"textField":"{{textField}}",
+{% if dataparams %}
+		"dataparams": {{json.dumps(dataparams)}},
+{% endif %}
 {% if get_data_url %}
-		"dataurl": "{{get_data_url}}"
+		"dataurl": "{{get_data_url}}",
 {% else %}
 		"dataurl":{%- raw -%}"{{entire_url('./get_{%- endraw -%}{{tblname}}{%- raw -%}.dspy')}}"{%- endraw %}
 {% endif %}
diff --git a/xls2crud.py b/xls2crud.py
index 7b6ded3..8dc5052 100644
--- a/xls2crud.py
+++ b/xls2crud.py
@@ -40,7 +40,7 @@ def subtable2toolbar(desc):
 		desc.toolbar = DictObject(**{
 			"tools":[]
 		})
-	tools = desc.toolbar.tools
+	tools = desc.toolbar.tools or []
 	binds = desc.binds or []
 	for st in desc.subtables:
 		tools.append({