node: guarantee that vars is a hash

Fixes ytti/oxidized-web#365

Author: ytti

CHANGELOG.md

@@ -11,7 +11,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 ### Changed
 
 ### Fixed
-
+Guarantee that node vars is a dict (Issue ytti/oxidized-web#365) (@ytti)
 
 ## [0.34.2 – 2025-08-01]
 This release mainly fixes a bug in input/scp that made ssh raise an error when

lib/oxidized/node.rb

@@ -27,7 +27,7 @@ def initialize(opt)
       @output = resolve_output opt
       @auth = resolve_auth opt
       @prompt = resolve_prompt opt
-      @vars = opt[:vars]
+      @vars = opt[:vars] || {}
       @stats = Stats.new
       @retry = 0
       @repo = resolve_repo opt