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--- master/lib/Munin/Master/Utils.pm.orig	2012-07-30 09:25:33.000000000 -0500
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+++ master/lib/Munin/Master/Utils.pm	2012-08-05 14:07:57.236121331 -0500
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@@ -904,6 +904,9 @@
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 	my $storable_filename_tmp = $storable_filename . ".tmp.$$";
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+	use Carp qw(cluck);
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+	cluck "data is null at " unless $data;
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+
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 	# Write datafile.storable, in network order to be architecture indep
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         Storable::nstore($data, $storable_filename_tmp);
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