Fix GifReader exceptions (#13760)
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		| @@ -6,7 +6,7 @@ class GifReader | |||||||
|   EXTENSION_LABELS = [0xf9, 0x01, 0xff].freeze |   EXTENSION_LABELS = [0xf9, 0x01, 0xff].freeze | ||||||
|   GIF_HEADERS      = %w(GIF87a GIF89a).freeze |   GIF_HEADERS      = %w(GIF87a GIF89a).freeze | ||||||
|  |  | ||||||
|   class GifReaderException; end |   class GifReaderException < StandardError; end | ||||||
|  |  | ||||||
|   class UnknownImageType < GifReaderException; end |   class UnknownImageType < GifReaderException; end | ||||||
|  |  | ||||||
|   | |||||||
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