minor fix to suppport treeview for task (#4279)

frappe/desk/treeview.py

@@ -59,7 +59,7 @@ def make_tree_args(**kwarg):
 	
 	doctype = kwarg['doctype']
 	parent_field = 'parent_' + doctype.lower().replace(' ', '_')
-	name_field = doctype.lower().replace(' ', '_') + '_name'
+	name_field = kwarg.get('name_field', doctype.lower().replace(' ', '_') + '_name')
 	
 	kwarg.update({
 		name_field: kwarg[name_field],

frappe/public/js/frappe/views/treeview.js

@@ -43,6 +43,7 @@ frappe.views.TreeView = Class.extend({
 			this.get_root();
 		}
 
+		this.onload();
 		this.set_menu_item();
 		this.set_primary_action();
 	},
@@ -80,6 +81,10 @@ frappe.views.TreeView = Class.extend({
 			this.body = this.page.main;
 		}
 	},
+	onload: function() {
+		var me = this;
+		this.opts.onload && this.opts.onload(me);
+	},
 	make_filters: function(){
 		var me = this;
 		frappe.treeview_settings.filters = []