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Windows: Fix AV in build due to userns

Signed-off-by: John Howard <jhoward@microsoft.com>

John Howard authored on 2015/10/14 06:01:36
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@@ -25,6 +25,13 @@ func UnpackLayer(dest string, layer Reader, options *TarOptions) (size int64, er
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 	defer pools.BufioReader32KPool.Put(trBuf)
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 	var dirs []*tar.Header
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+
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+	if options == nil {
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+		options = &TarOptions{}
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+	}
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+	if options.ExcludePatterns == nil {
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+		options.ExcludePatterns = []string{}
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+	}
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 	remappedRootUID, remappedRootGID, err := idtools.GetRootUIDGID(options.UIDMaps, options.GIDMaps)
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 	if err != nil {
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 		return 0, err