Avoid incompatibility warning for very old (pre-earmarked) projects

history.txt

@@ -2446,3 +2446,4 @@ ______
 ------
 * Blocks, Objects: Add user-interaction choices to the “When I am ...” hat block
 * Update German translation
+* Store: Avoid incompatibility warning for very old (pre-earmarked) projects

store.js

@@ -61,7 +61,7 @@ SyntaxElementMorph, Variable*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.store = '2015-January-21';
+modules.store = '2015-February-23';
 
 
 // XML_Serializer ///////////////////////////////////////////////////////
@@ -320,7 +320,7 @@ SnapSerializer.prototype.loadProjectModel = function (xmlNode, ide) {
     var appInfo = xmlNode.attributes.app,
         app = appInfo ? appInfo.split(' ')[0] : null;
 
-    if (ide && app !== this.app.split(' ')[0]) {
+    if (ide && app && app !== this.app.split(' ')[0]) {
         ide.inform(
             app + ' Project',
             'This project has been created by a different app:\n\n' +