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@@ -653,6 +653,11 @@ class FlatViewDataGenerator
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arsort($v);
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arsort($v);
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$maximum = array_shift($v);
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$maximum = array_shift($v);
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$minimum = array_pop($v);
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$minimum = array_pop($v);
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+
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+ if (is_null($minimum)) {
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+ $minimum = 0;
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+ }
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+
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$summary= array(
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$summary= array(
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'max' => $maximum,
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'max' => $maximum,
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'min' => $minimum,
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'min' => $minimum,
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