Index: trunk/ippScripts/scripts/magic_destreak.pl
===================================================================
--- trunk/ippScripts/scripts/magic_destreak.pl	(revision 30694)
+++ trunk/ippScripts/scripts/magic_destreak.pl	(revision 31435)
@@ -360,5 +360,10 @@
         $command .= " -chip_mask $ch_mask" if defined $ch_mask;
         $command .= " -weight $weight" if defined $weight;
-        $command .= " -sources $sources" if defined $sources;
+	if ((defined($sources))&&($ipprc->file_exists($sources))) {
+	    $command .= " -sources $sources" if defined $sources;
+	}
+	else {
+	    print "Did not add sources because they do not appear to exist. This may be an error.\n";
+	}
         $command .= " -skycelllist $skycell_list" if defined $skycell_list;
         $command .= " -replace" if $replace;