(fix) avoid broken redirects on sessions expiration

UI/Common/UIxPageFrame.m

@@ -466,8 +466,12 @@
 
 - (NSString *) userIdentification
 {
+  NSString *v;
+
   /* The "identification" term is used in the human sense here. */
-  return [[context activeUser] cn];
+  v = [[context activeUser] cn];
+
+  return (v ? v : @"");
 }
 
 - (NSString *) userEmail

UI/SOGoUI/UIxComponent.m

@@ -364,6 +364,9 @@ static SoProduct      *commonProduct      = nil;
 
       baseURL = [[self clientObject] baseURLInContext: context];
 
+      if (!baseURL)
+        baseURL = @"/SOGo/so/";
+
       if ([baseURL hasSuffix: [NSString stringWithFormat: @"%@/", [[self parent] modulePath]]])
         return baseURL;