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[Merge] ~smoser/cloud-init:fix/run-centos-unbound-var into cloud-init:master


Scott Moser has proposed merging ~smoser/cloud-init:fix/run-centos-unbound-var into cloud-init:master.

Commit message:
tools/run-centos: make running with no argument show help.

If you ran tools/run-centos without an argument it would fail due
to 'set -u' like:
  ./tools/run-centos: line 266: 1: unbound variable

Requested reviews:
  cloud-init commiters (cloud-init-dev)

For more details, see:
Your team cloud-init commiters is requested to review the proposed merge of ~smoser/cloud-init:fix/run-centos-unbound-var into cloud-init:master.
diff --git a/tools/run-centos b/tools/run-centos
index b10e3bc..d44d514 100755
--- a/tools/run-centos
+++ b/tools/run-centos
@@ -262,7 +262,7 @@ main() {
     return 0
-if [ "$1" = "prep" ]; then
+if [ "${1:-}" = "prep" ]; then
     prep "$@"