web client: disallow empty collection members

1 files changed, 9 insertions, 1 deletions

diff --git a/web/transaction.js b/web/transaction.js
index 7c2101f..5c0488d 100644
--- a/web/transaction.js
+++ b/web/transaction.js
@@ -157,6 +157,9 @@ define(
 			ensureKeyPresence(name);
 			var value = data.get(name, true);
 
+			var empty = newValue === null &&
+			    type.isCollection(data.meta);
+			if (newValue === undefined) newValue = null;
 			var tn = _.isObject(newValue);
 			var npv = tn ? mpath : newValue;
 
@@ -186,6 +189,11 @@ define(
 			}
 
 			prevTask.always(function() {
+			    if (empty) {
+				def.reject("Value not set");
+				return;
+			    }
+
 			    var del = newValue == null;
 
 			    var options;
@@ -330,7 +338,7 @@ define(
 			var def = $.Deferred();
 			var length = data.data.length;
 
-			data.set(name, null).done(function(txnValid) {
+			data.set(name).done(function(txnValid) {
 			    if (type.isTreeNode(data.meta) &&
 				data.meta.type != "set") {