[Seaside] WAImage class>>fromByteArray: fix

[Boris Popov]

Just came across this when trying to load files less than 6 bytes in
size where outer handler tests the file for being a picture by catching
NotAnImage exception; fix just adds the size check on the first line,

WAImage class>>fromByteArray: aByteArray
 | dim gifHeaders header |
 aByteArray size < 6 ifTrue: [NotAnImage raise].
 ...

Thanks!

-Boris

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