Allow 'secrets' and 'vars' to be blank

main.go

@@ -93,13 +93,17 @@ func run(c *cli.Context) error {
 	json.Unmarshal([]byte(c.String("terraform.remote")), &remote)
 
 	var vars map[string]string
+	if c.String("terraform.vars") != "" {
 		if err := json.Unmarshal([]byte(c.String("terraform.vars")), &vars); err != nil {
 			panic(err)
 		}
+	}
 	var secrets map[string]string
+	if c.String("terraform.secrets") != "" {
 		if err := json.Unmarshal([]byte(c.String("terraform.secrets")), &secrets); err != nil {
 			panic(err)
 		}
+	}
 
 	plugin := Plugin{
 		Config: Config{