[Zope] ZDebug 0.2 incompatible with Formulator 1.0

[Dieter Maurer]

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Just analysed a strange exception during form validation with
Formulator:

  Zope reported a "TypeError: expected 3, got 2 arguments"
  from "ZDebug.DTMLDebug.py:184".
  This is in the middle of a call to "dtmlexc", no function call
  around.

  It turned out that:

      The problem was the creation of the exception object.
      ZDebug assumes that exceptions accept a single string
      argument, but "FormValidationError" wants 2 arguments.

Attached is a patch trying to work around the problem:

  It raises the exception in a "try ... except".
  When this raises the expected exception, then it is reraised;
  otherwise, the original exception is raised (which is
  not so good as the ZDebug Message but better than nothing).

Dieter

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Content-Type: application/x-patch
Content-Description: ZDebug Patch to let is better harmonize with products defining their own exception classes
Content-Disposition: attachment;
	filename="ZDebug-Exc.pat"
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