If one tries to generate history from old nxs workspace and some algorithms used to build this workspace are removed, the history can not be generated.

[Alex Buts]

Start Matid 3.0 (or later) and load MARIReduction.nxs (from System tests reference results)

Open "show history" and try "Script To clipboard" (or to file).

Action fails as FlatBackground is not registered any more (Calculate FlatBackground is in Mantid instead)

We need to be able to generate history for old workspaces which contain deprecated/missing algorithms

[Alex Buts]

refs #8648 This should fix it

The missing algorithm does not throw the history but prints the contents of the missing algorithm.

Changeset: ec71fa4a7d0ca777ddca2ea7dc0da561c8194fcc

[Alex Buts]

It is not a very smart solution, but I think is the reasonable one as anything else would request huge efforts and changes in framework.

If an algorithm is not registered with Mantid any more, GeneratePythonScript does not fails but prints the old algorithm signature and properties which would allow user to recover the algorithm contents.

After this fix tester should be able to generate history from MARIReduction.nxs which is failing now and look at the history to be able to recover the properties of the FlatBackground algorithm which does not exist any more. (until I have changed MARIReduction.nxs for another ticket.)

[Andrei Savici]

Merge remote-tracking branch 'origin/bugfix/8648_missingAlgoHistory'

Full changeset: ​b3bda0928ac4567ea5ab3af1f9afeccc5db2b3e8

[Stuart Campbell]

This ticket has been transferred to github issue ​9492