Fix notice in DatasetManager
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		@@ -84,7 +84,7 @@ class DatasetManager
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        if (file_exists($fn)) {
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					        if (file_exists($fn)) {
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            $versions = include $fn;
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					            $versions = include $fn;
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            foreach ($versions['versions'] as $name=>$version) {
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					            foreach ($versions['versions'] as $name=>$version) {
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                self::$packageVersions[$name] = $version['version'];
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					                self::$packageVersions[$name] = array_key_exists('version',$version) ? $version['version'] : null;
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            }
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					            }
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        }
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					        }
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