PR for issue #60 (#78)

muk_web_preview_msoffice/static/src/js/preview_handler.js

@@ -117,6 +117,19 @@ var ExcelHandler = PreviewHandler.BaseHandler.extend({
 		    			var $pane = $('<div/>');
 		    			$pane.addClass('tab-pane table-container');
 		    			$pane.attr('id', 'sheet-' + index);
+					var maximum_arrs = 1;
+					sheet.forEach(function (arr) {
+						if(arr.length>maximum_arrs){
+							maximum_arrs = arr.length;
+						}
+					});
+					sheet.forEach(function (arr) {
+						if(arr.length<maximum_arrs){
+							for (var i = arr.length; i < maximum_arrs; i++) {
+								arr.push("");
+							}
+						}
+					});
 		    			$pane.handsontable({
 						    data: sheet,
 						    rowHeaders: true,
@@ -149,4 +162,4 @@ return {
 	PowerPointHandler: PowerPointHandler,
 };
 
-});
+});