FNP: Fixes for page breaks/yoffset for component list sections & overlap bottom message & text

Fix null reference when migrating FNP table

PROMS/Volian.Controls.Library/VlnFlexGrid.cs

@@ -4031,7 +4031,7 @@ namespace Volian.Controls.Library
 						if (rC > c)
 						{
 							this.MergedRanges.Add(this.GetCellRange(r, c, r, rC));
-							string cellstr = this[r, c].ToString();
+							string cellstr = (this[r,c]==null)? " ": this[r, c].ToString();
 							for (int x = c + 1; x <= rC; x++)
 								this[r, x] = cellstr;
 							c = rC;