[IDA] ConvFit - Unexpected Exception When Plotting

[PeterParker]

To reproduce, use the attached files to set up the ConvFit tab of the IDA interface as it appears in the screenshot. The value of "Use" in the property table must be set to true, and "Plot Guess" must also be checked.

Clicking anywhere in the plotted graph should throw the error.

[PeterParker]

This issue was originally trac ticket 4878

[PeterParker]

http://trac.mantidproject.org/mantid/raw-attachment/ticket/4878/osi94909_graphite002_red.nxs
(uploaded by @PeterParker on 2012-02-24T10:41:24)

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http://trac.mantidproject.org/mantid/raw-attachment/ticket/4878/osi94910_graphite002_res.nxs
(uploaded by @PeterParker on 2012-02-24T10:41:44)

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http://trac.mantidproject.org/mantid/raw-attachment/ticket/4878/Screenshot.png

(uploaded by @PeterParker on 2012-02-24T10:42:25)

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