fix bug 33030

cell/model/clipboard.js

@@ -144,8 +144,11 @@
 						if(ws.getCellEditMode() === true)
 						{
 							var text = data1.innerText;
+							if(text)
+							{
 								window["Asc"]["editor"].wb.cellEditor.pasteText(text);
 							}
+						}
 						else
 						{
 							t.pasteProcessor.editorPasteExec(ws, data1);
@@ -158,8 +161,11 @@
 						if(ws.getCellEditMode() === true)
 						{
 							var text = t.pasteProcessor.pasteFromBinary(ws, data1, true);
+							if(text)
+							{
 								window["Asc"]["editor"].wb.cellEditor.pasteText(text);
 							}
+						}
 						else
 						{
 							t.pasteProcessor.pasteFromBinary(ws, data1);
@@ -170,9 +176,12 @@
 					case AscCommon.c_oAscClipboardDataFormat.Text:
 					{
 						if(ws.getCellEditMode() === true)
+						{
+							if(text)
 							{
 								window["Asc"]["editor"].wb.cellEditor.pasteText(data1);
 							}
+						}
 						else
 						{
 							t.pasteProcessor.pasteTextOnSheet(ws, data1);