From f4f61cb57a1f1697995c521bf98d58284699bab9 Mon Sep 17 00:00:00 2001
From: Vaidas Jablonskis <jablonskis@gmail.com>
Date: Mon, 17 Oct 2016 21:43:41 +0100
Subject: [PATCH] Fix exec panic when missing variables

Fixes #1810
---
 yaml/transform/util.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/yaml/transform/util.go b/yaml/transform/util.go
index 910390b6..1f4b336f 100644
--- a/yaml/transform/util.go
+++ b/yaml/transform/util.go
@@ -15,6 +15,11 @@ import (
 func argsToEnv(from map[string]interface{}, to map[string]string) error {
 
 	for k, v := range from {
+		if v == nil {
+			to[k] = ""
+			continue
+		}
+
 		t := reflect.TypeOf(v)
 		vv := reflect.ValueOf(v)