Fix substring initial offset value

Remove only the leading comma character.

site-generator

@@ -290,11 +290,8 @@ sub parse_page_arg {
     # Split page name from page ids if available.
     my ($page, $ids) = split(/=/, $page_arg);
     my @ids;
+    $ids = "" unless defined $ids;
 
-    if(!$ids) {
-        $ids = "";
-    }
-    else {
     # Parse the page ids and push them onto @ids array
     my @ids_by_comma = split(/\,/, $ids);
     foreach my $id_by_comma (@ids_by_comma) {
@@ -309,7 +306,7 @@ sub parse_page_arg {
             verbose (1, "\nWarning: Page $page id range $id_by_comma could not be parsed.");
         }
     }
-    }
+    
     return ('page' => $page, 'ids' => [@ids]);
 }
 
@@ -326,7 +323,7 @@ sub get_ids_from_db {
         || die $tt->error(), "\n";
 
         # Starts with a newline and comma
-        return split(/,/, substr($selected_ids, 2));
+        return split(/,/, substr($selected_ids, 1));
 }
 
 sub get_filename {