fix(the bug with first word is space): fix ti

src/global/getRowlen.js

@@ -928,6 +928,7 @@ function getCellTextInfo(cell , ctx, option){
                     let height = textWidth * Math.sin(rt*Math.PI/180) + textHeight * Math.cos(rt*Math.PI/180);//consider text box wdith and line height
                     let lastWord = str.substr(str.length-1,1);
                     if(lastWord==" " || checkWordByteLength(lastWord)==2){
+                        if(preMeasureText!=null){
                             spaceOrTwoByte = {
                                 index:i,
                                 str:preStr,
@@ -936,6 +937,7 @@ function getCellTextInfo(cell , ctx, option){
                                 asc:preMeasureText.actualBoundingBoxAscent,
                                 desc:preMeasureText.actualBoundingBoxDescent,
                             };
+                        }
 
                     }
                     // textW_all += textW;