Index: wp-admin/admin-functions.php
===================================================================
--- wp-admin/admin-functions.php	(revision 3425)
+++ wp-admin/admin-functions.php	(working copy)
@@ -988,11 +988,15 @@
 		$foundit = false;
 		if ($markerdata) {
 			$state = true;
-			foreach ($markerdata as $markerline) {
+			foreach ($markerdata as $n => $markerline) {
 				if (strstr($markerline, "# BEGIN {$marker}"))
 					$state = false;
-				if ($state)
-					fwrite($f, "{$markerline}\n");
+				if ($state) {
+					if ( $n + 1 < count($markerdata) )
+						fwrite($f, "{$markerline}\n");
+					else
+						fwrite($f, "{$markerline}");
+				}
 				if (strstr($markerline, "# END {$marker}")) {
 					fwrite($f, "# BEGIN {$marker}\n");
 					if (is_array($insertion))