When trying to use the Compare with latest template function in standard change proposals of 'Modify an existing template' Proposal type, if the value of a custom Change Request field is set to "--none--", the diff function breaks. - Known Error

When trying to use the Compare with latest template function in standard change proposals of 'Modify an existing template' Proposal type, if the value of a custom Change Request field is set to "--none--", the diff function breaks. Description When trying to use the Compare with latest template function in standard change proposals of 'Modify an existing template' Proposal type, if the value of a custom Change Request field is set to "--none--", the diff function breaks.

Steps to Reproduce

01) Navigate to sys_dictionary.list and create a new record: Table: change_request Type: String Column label: U String Field Column name: u_string_field Max length: 40 Choice List Specification > Choice: Dropdown with -- None --

02) Navigate to std_change_record_producer.list and open 'Reboot Windows Server' (or any other Template name)

03) Under Related Links, click on 'Modify Template' Template description : test Change Request values > Assignment Group : Change Management Change Request values > Justification : test Change Request values > Risk and impact analysis : test Change Request values > U String Field : -- None --

Then click 'Save' at the bottom right

04) After page reloads, under Related Links, click on 'Compare with latest template'

EXPECTED: Compare with latest template should be able to compare changes

ACTUAL: Compare with latest template breaks with the following error: TypeError: Cannot convert null to an object. (sys_script_include.871fb6060a0a0bb000fc0c937940583d.script; line81)

Workaround Within the StdChangeUtils Script Include, add the following function to the script to override the _getDisplayValueFromGlideRecord function:

_getDisplayValueFromGlideRecord: function(name, queryNameLabels, queryNameValues, sampleChangeGr) { var displayValue = ""; var fieldName; var fieldValue; var queryCtr = -1; for (var i = 0; i = 0) { fieldName = queryNameValues.names[queryCtr]; fieldValue = queryNameValues.vals[queryCtr]; if (fieldValue.startsWith('javascript:')) { var scriptEvaluator = new GlideScriptEvaluator(); scriptEvaluator.setEnforceSecurity(true); fieldValue = scriptEvaluator.evaluateString(fieldValue, false) + ""; } if (queryNameLabels[queryCtr].valid) { sampleChangeGr.setValue(fieldName, fieldValue); displayValue = sampleChangeGr.getDisplayValue(fieldName); } else displayValue = fieldValue; } // The Differ that ends up using these values dies spectacularly when given a null value to diff if (typeof displayValue === "undefined" || displayValue == null) return ""; return displayValue; }, The bold section of code is the change that prevents this problem from occurring. Related Problem: PRB1526094