Failing to add Alert-Info header on inbound calls

Looks like the function func-apply-sipheaders is not adding sip headers.  When I set the Alert-Info field for an inbound route on the FreePBX GUI, the header is not being added when I attempt a call.  I believe that the line below should have a "!=" instead of an "="

exten => s,n,ExecIf($["${HASH(SIPHEADERS,${sipkey})}" = “”]?Set(Addheader=1))

[func-apply-sipheaders]
include => func-apply-sipheaders-custom
exten => s,1,Noop(Applying SIP Headers to channel)
exten => s,n,Set(SIPHEADERKEYS=${HASHKEYS(SIPHEADERS)})
exten => s,n,ExecIf($["${HASH(SIPHEADERS,Alert-Info)}" = “unset”]?Set(Rheader=1))
exten => s,n,While($["${SET(sipkey=${SHIFT(SIPHEADERKEYS)})}" != “”])
exten => s,n,Set(sipheader=${HASH(SIPHEADERS,${sipkey})})
exten => s,n,ExecIf($["${HASH(SIPHEADERS,${sipkey})}" = “”]?Set(Addheader=1))
exten => s,n,ExecIf($["${Addheader}" = “1”]?SIPAddHeader(${sipkey}:${sipheader}))
exten => s,n,ExecIf($["${Addheader}" = “1”]?Set(PJSIP_HEADER(add,${sipkey})=${sipheader}))
exten => s,n,EndWhile
exten => s,n,ExecIf($["${Rheader}" = “1”]?SIPRemoveHeader(Alert-Info)
exten => s,n,ExecIf($["${Rheader}" = “1”]?Set(PJSIP_HEADER(remove,Alert-Info)=))
exten => s,n,Return()