Exercise interface not saving Variable field

[David Coles]

Reported by Olivia via UoM Engineering Helpdesk (INC000000414055)
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Variables in the exercise environment:

I am trying to save a variable in the testing environment
and every time I click 'save variable' it says "variable added
successfully", reloads the page and in doing so removes the data I put in the
variable fields.

I am working on ch08_1.xml

What I would like to run the above test is as follows:

Type: arg Var Name: Var Value: ['John', 'saw', 'the', 'dog', 'and', 'the',
'cat'] Arg Num: 0

After I click 'save variable' I get:

Type: arg Var Name: arg Var Value: Arg Num:

[William Grant (wgrant)]

This has been fixed somewhere in my fixing.