[Seaside-dev] Guard in file upload

[Sean P. DeNigris]

In Dynamic Web Development with Seaside - 10.7 File Uploads, the code has the
following:
UploadForm>>receiveFile: aFile
    | file |
    aFile isNil ifTrue: [ ^ nil ].
...

The explanation says:

Note that it is possible to press the Send File button before selecting a
file. The #receiveFile: method guards against this by checking that file is
not nil.

However, I put a halt in the block, and hit the "Send file" button, and it
seems this is never called:
	aFile isNil ifTrue: [
		self halt.
		self inform: 'No file!'].

Is this guard necessary?

Thanks.
Sean
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