negative column width

cell/model/Serialize.js

@@ -5665,6 +5665,9 @@
             else if ( c_oSerWorksheetColTypes.Width == type )
             {
                 oCol.width = this.stream.GetDoubleLE();
+				if (oCol.width < 0) {
+					oCol.width = 0;
+				}
                 if(AscCommon.CurFileVersion < 2)
                     oCol.CustomWidth = 1;
             }

cell/model/Workbook.js

@@ -4386,7 +4386,7 @@ Woorksheet.prototype.setColHidden=function(bHidden, start, stop){
 			else
 			{
 				col.hd = null;
-				if(0 == col.width)
+				if(0 >= col.width)
 					col.width = null;
 			}
 			var oNewProps = col.getWidthProp();