Improve deletion of workspaces that are in the ADS #1045
Merged
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Description of work:
Deleting a workspace within MSlice that is also in the ADS caused a crash in Mantid. The reason was that deleting the workspace in MSlice updated the ADS and, as a result, the ADS triggered a deletion request for this workspace in MSlice. This request then failed as the workspace was already deleted within MSlice. To avoid this situation, MSlice does not attempt to delete non-existing workspaces anymore. In addition, all corresponding hidden workspaces are now deleted from the ADS as well.
To test:
Follow the instructions on the original issue.
Fixes #1044.