fixed a bug that happened when rendering spaces

in monochrome mode..

actually, when outline.num_points == 0, it is legal
to have outline.points == 0 too. The code did return
a FT_Err_Invalid_Outline error incorrectly then because
the checks were not performed in the correct order

src/raster1/ftraster.c

@@ -3255,13 +3255,13 @@
     if ( !raster || !raster->buff || !raster->sizeBuff )
       return Raster_Err_Not_Ini;
 
-    if ( !outline || !outline->contours || !outline->points )
-      return Raster_Err_Invalid;
-
     /* return immediately if the outline is empty */
     if ( outline->n_points == 0 || outline->n_contours <= 0 )
       return Raster_Err_None;
 
+    if ( !outline || !outline->contours || !outline->points )
+      return Raster_Err_Invalid;
+
     if ( outline->n_points != outline->contours[outline->n_contours - 1] + 1 )
       return Raster_Err_Invalid;