Due to an hardware issue, s1w fields are missing

[JeanBilheux]

This issue was originally TRAC 6330

This crash the reduction. Catch error and let the code continue

[JeanBilheux]

@JeanBilheux (2012-12-19T19:43:40):
Fixed issue of missing S1W. Need to be tested by Jim. this refs http://trac.mantidproject.org/mantid/ticket/6330
d2ddd51

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@JeanBilheux (2013-01-09T16:01:35):
Fixed issue of missing S1W. Need to be tested by Jim. this refs http://trac.mantidproject.org/mantid/ticket/6330
7223026

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@NickDraper (2013-01-28T09:23:22):
Moved at the code freeze for release 2.4

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@NickDraper (2013-04-29T09:49:55):
Moved to r2.6 at the end of r2.5

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@NickDraper (2013-07-26T13:55:00):
Moved to backlog at the code freeze for R2.6

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@NickDraper (2014-02-14T11:04:58):
Bulk move to assigned at the introduction of the triage step

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