The addStringParam method of Class JobConfiguration is invalid

The error occurred on line 46:
`List propertiesNode = doc.selectNodes("//project/properties");`
It won't get any nodes,because of the parameter:
> //project/properties

Shouldn't it be "//properties" ?

Open Class JobConfiguration and inspect addStringParam around line 46, focusing on the doc.selectNodes XPath shown in the issue. Trace how the selected properties node is used and verify that the corrected selection finds the intended project properties. Done means the method no longer returns an empty selection for a configuration containing properties.

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