SassenaFFT produces warning when running second time

[Martyn Gigg]

While testing #6510 about running SassenaFFT twice I observed a warning "Workspace already exists in a WorkspaceGroup" that is most probably spurious but could confuse a user. Check whether the warning is necessary and fix it if possible.

To reproduce use the testing steps in the ticket mentioned above.

[Jose Borreguero]

Sassena output file containing I(Q,t>0)

[Jose Borreguero]

python script to run in MantidPlot

[Jose Borreguero]

WorkspaceGroup::addWorkspace() sends a warning message when the workspace being added is already present int he workspace group

[Jose Borreguero]

Refs #6644 check if workspace already present in the group

Changeset: bff403afb40135039a3a4cb6c959d5e0e07bf80b

[Jose Borreguero]

Refs #6644 check if workspace already present in the group

Changeset: bff403afb40135039a3a4cb6c959d5e0e07bf80b

[Jose Borreguero]

Testing feature/6644_sassenafft_warning_mssg:

1. Download example.h5 and example.py
2. In a MantidPlot session, run example.py

Check that:

1. No warning messages are output in the results log window
2. Workspaces 'clone' and 'example_sqw' are different. The first is a Gaussian, the second is a Gaussian with a negative dip and negative energies

[Gesner Passos]

The changes are already inside the master because they have been applied at #6776. If you try to merge it, it will complain about merging, but there are only spaces. So, I have not applied to master. The example.py runs withou warning. But, I found interesting that if you try to execute this code:

LoadSassena(Filename='example.h5',OutputWorkspace='example')
LoadSassena(Filename='example.h5',OutputWorkspace='example')

You get an exception:

RuntimeError:  add : Unable to insert Data Object : 'example_qvectors'
  at line 2 in 'example.py'
  caused by line 491 in 'mantid/simpleapi.py'

Is this acceptable? (The second line is useless, but should it throw exception?) Could you consider if this should be reported as a new ticket?

[Stuart Campbell]

This ticket has been transferred to github issue ​7490