From a7b8e7516be325265dce7300b17359d15a1715e0 Mon Sep 17 00:00:00 2001
From: Daniel Friesel <derf@finalrewind.org>
Date: Tue, 14 Jun 2022 22:24:50 +0200
Subject: correctly initialize ice_type_map hash

This ensures proper operation when the zugbildungsplan is empty, e.g. because
the underlying source file has become invalid.

Closes #14
---
 lib/DBInfoscreen.pm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/DBInfoscreen.pm b/lib/DBInfoscreen.pm
index 7730f90..53944fd 100644
--- a/lib/DBInfoscreen.pm
+++ b/lib/DBInfoscreen.pm
@@ -94,7 +94,7 @@ sub startup {
 			if ( -r 'share/zugbildungsplan.json' ) {
 				my $ice_type_map = JSON->new->utf8->decode(
 					scalar read_file('share/zugbildungsplan.json') );
-				my $ret;
+				my $ret = {};
 				while ( my ( $k, $v ) = each %{ $ice_type_map->{train} } ) {
 					if ( $v->{type} ) {
 						$ret->{$k} = [
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