FUNCTION No_Data

;+
; NAME:
; 	No_Data
; PURPOSE:
;	Test if there is data in the plot table or not. If there
;	is, the value "0" is returned else "1".
;  CATEGORY:
;	Data Management
; CALLING SEQUENCE:
;	boolValue = No_Data()
; COMMON BLOCK:
;	Data, where the plot table is stored. Should not
;	be accessed directly.
;-
; MODIFICATION HISTORY:
;	Created in May 1991 by A.Csillaghy

  COMMON Data, plotList, dum2 

  RETURN,(N_Elements(plotList) LE 1) 

END