Fixed sde-update-tree to not error when there is no package/* because package/ is not yet cloned

bin/sde-update-tree

@@ -54,7 +54,7 @@ cd "$SDEROOT"
 tree="${SDEROOT##*/}"
 # hunt for the roots of the sub-working trees
 #
-for x in . package package/* target/*; do
+for x in $( ls -1d . package package/* target/* 2> /dev/null ); do
 	if [ ! -d "$x" ]; then
 		case "$x" in
 			package)