Index: applications/editors/josm/i18n/convwms.pl
===================================================================
--- applications/editors/josm/i18n/convwms.pl	(revision 26939)
+++ applications/editors/josm/i18n/convwms.pl	(revision 28252)
@@ -21,5 +21,7 @@
 if($ARGV[0] && $ARGV[0] =~ /^http:\/\//)
 {
-  @lines = split("\r?\n", get($ARGV[0]));
+  my $content = get($ARGV[0]);
+  die "Couldn't get $ARGV[0]" unless defined $content;
+  @lines = split("\r?\n", $content);
 }
 else