Don't call asset methods on undef in the GalleryAlbum. Fixes bug #11681.

docs/changelog/7.x.x.txt

@@ -12,7 +12,7 @@
  - fixed #11678: Story Archive leaks version tags
  - fixed #11671: Approving version tags takes up 1 to hour to take affect.
  - fixed #11663: More detail section of image gallery
-
+ - fixed #11681: Gallery album chokes on photo w/ missing properties
 
 7.9.7
  - added #11571: Allow return from photo edit view to gallery edit view

lib/WebGUI/Asset/Wobject/GalleryAlbum.pm

@@ -230,8 +230,9 @@ sub appendTemplateVarsFileLoop {
     my $assetIds    = shift;
     my $session     = $self->session;
 
-    for my $assetId (@$assetIds) {
+    ASSET: for my $assetId (@$assetIds) {
         my $asset = WebGUI::Asset->newByDynamicClass($session, $assetId);
+        next ASSET unless $asset;
         # Set the parent
         $asset->{_parent} = $self;
         push @{$var->{file_loop}}, $asset->getTemplateVars;