fpspreadsheet: Initial version to display embedded images in the WorksheetGrid

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@5800 8e941d3f-bd1b-0410-a28a-d453659cc2b4

components/fpspreadsheet/source/common/fpsutils.pas

@@ -2127,6 +2127,7 @@ begin
   AValue.OffsetY := AOffsetY;
   AValue.ScaleX := AScaleX;
   AValue.ScaleY := AScaleY;
+  AValue.Bitmap := nil;     // to be initialized by viewing application
   AValue.Index := -1;
 end;