fixed: Matrix caches pages, and may not update for new listings

docs/changelog/7.x.x.txt

@@ -5,6 +5,7 @@
  - fixed: Wiki page history shows username instead of alias
  - added: Uploads locations and files are set to the same uid/gid that owns the uploads root
  - fixed: SQL Form fields with a regex are required even if not set to required
+ - fixed: Matrix caches pages, and may not update for new listings
 
 7.5.6
  - fixed: events get start/end time even when none specified (also can offset start/end day)

lib/WebGUI/Asset/Wobject/Matrix.pm

@@ -100,6 +100,11 @@ sub duplicate {
 	return undef;
 }
 
+#-------------------------------------------------------------------
+# Too much data to keep track of modification dates, always assume new data
+sub getContentLastModified {
+    return time();
+}
 
 #-------------------------------------------------------------------
 sub formatURL {
@@ -1140,7 +1145,7 @@ sub www_viewDetail {
 		$var{screenshot} = $storage->getUrl($listing->{filename});
 		$var{thumbnail} = $storage->getThumbnailUrl($listing->{filename});
 	}
-	$var{"discussion"} = $forum->view;
+	$var{"discussion"} = $forum && $forum->view;
 	$var{'isLoggedIn'} = ($self->session->user->userId ne "1");
 	if ($self->session->form->process("do") eq "sendEmail" && $self->session->form->process("verify","captcha")) {
 		if ($self->session->form->process("body") ne "") {