Index: trunk/ippScripts/scripts/diff_skycell.pl
===================================================================
--- trunk/ippScripts/scripts/diff_skycell.pl	(revision 12111)
+++ trunk/ippScripts/scripts/diff_skycell.pl	(revision 12115)
@@ -107,4 +107,5 @@
 &my_die("Unable to identify template", $diff_id, $PS_EXIT_SYS_ERROR) unless defined $template;
 &my_die("Unable to identify input", $diff_id, $PS_EXIT_SYS_ERROR) unless defined $input;
+&my_die("Unable to identify camera", $diff_id, $PS_EXIT_SYS_ERROR) unless defined $camera;
 $ipprc->define_camera($camera);