Fix buck run when $ONOS_DIR does not exist

Change-Id: I437e1a3f7afb30f0324260cb424fcc669ca03972
diff --git a/tools/package/onos-run-karaf b/tools/package/onos-run-karaf
index 4d57299..e223a61 100755
--- a/tools/package/onos-run-karaf
+++ b/tools/package/onos-run-karaf
@@ -14,7 +14,7 @@
 
 ONOS_DIR=$(tar tf $ONOS_TAR | head -n 1 | cut -d/ -f1)
 
-if [ -d $ONOS_DIR -a "$1" = "clean" ]; then
+if [ -d $ONOS_DIR -a "$1" = "clean" -o ! -d $ONOS_DIR ]; then
     # Blitz previously unrolled onos- directory
     rm -fr $ONOS_DIR