tracker issue : CF-4202539

Issue: cannot assign null to variables in some scopes from CFC

Steps to Reproduce:
1) Enable NULL support
2) Create Application.cfc having:
-----------
component {
  THIS.name = "MyApp"
  THIS.applicationTimeout = createTimeSpan(0,0,0,10)
  THIS.sessionManagement = true
  THIS.sessionTimeout = createTimeSpan(0,0,0,10)
  THIS.enableNULLSupport=true
}
-----------
3) Create MyCFC.cfc having:
-----------
component {function f() {FORM.foo = null}}
-----------
4) Run index.cfm containing:
-----------
<cfscript>
  invoke("MyCFC", "f")
  writeDump(isNULL(FORM.foo))
</cfscript>
-----------

Actual and Expected Result: YES

5) In MyCFC.cfc, change FORM.foo to URL.foo
6) Run index.cfm containing:
-----------
<cfscript>
  invoke("MyCFC", "f")
  writeDump(isNULL(URL.foo))
</cfscript>
-----------

Actual and Expected Result: YES

7) In MyCFC.cfc, change URL.foo to SERVER.foo
8) Run index.cfm containing:
-----------
<cfscript>
  invoke("MyCFC", "f")
  writeDump(isNULL(SERVER.foo))
</cfscript>
-----------

Actual and Expected Result: YES

9) In MyCFC.cfc, change SERVER.foo to REQUEST.foo
10) Run index.cfm containing:
-----------
<cfscript>
  invoke("MyCFC", "f")
  writeDump(isNULL(REQUEST.foo))
</cfscript>
-----------

Actual Result: coldfusion.runtime.UndefinedElementException: Element FOO is undefined in a Java object of type class coldfusion.runtime.RequestScope.

Expected Result: YES

11) In MyCFC.cfc, change REQUEST.foo to SESSION.foo
12) Run index.cfm containing:
-----------
<cfscript>
  invoke("MyCFC", "f")
  writeDump(isNULL(SESSION.foo))
</cfscript>
-----------

Actual Result: coldfusion.runtime.UndefinedElementException: Element FOO is undefined in a Java object of type class coldfusion.runtime.MemorySessionScope.

Expected Result: YES

13) In MyCFC.cfc, change SESSION.foo to APPLICATION.foo
14) Run index.cfm containing:
-----------
<cfscript>
  invoke("MyCFC", "f")
  writeDump(isNULL(APPLICATION.foo))
</cfscript>
-----------

Actual Result: coldfusion.runtime.UndefinedElementException: Element FOO is undefined in a Java object of type class coldfusion.runtime.ApplicationScope.

Expected Result: YES

Related post: http://blog.cfaether.com/2018/05/cannot-assign-null-to-variables-in-some.html

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