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Yes the previous code only reports a condition in which no custom data key exists.

The following catches missing data for an existing key (in 1.5)

tell application "OmniPlan"
	set oTask to item 1 of child tasks of document 1
	set recData to custom data of oTask
	set varValue to |OPBug_ID| of recData
	if varValue is missing value then
		display dialog "Empty !"
		display dialog (varValue as string)
	end if
end tell