Javascript 如何跳过发送电子邮件的空白单元格？

如果学生缺勤，我会使用谷歌表单向家长和教练发送电子邮件。我遇到的问题是，有时教练的电子邮件没有列出，因为学生没有参加体育活动，所以它有一个空白单元格，然后脚本将停止运行。我只想让它跳过并继续沿着工作表向下移动。还有一种方法，我可以得到一个细胞，以确认它发送？比如，如果邮件失败，邮件旁边的手机会显示“已发送”或“错误”？我不是真的关心这部分，它只是会很好。我对这真的很陌生。谢谢

function SendCoachEmails() {

  SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Homework Hour 4.0").activate();//take off 4.0 when done with texting

  var ss = SpreadsheetApp.getActiveSpreadsheet().getActiveSheet();
  var lr = ss.getLastRow();
  var templateText = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("DO NOT DELETE! Parent Email Template").getRange(1, 1).getValue();
  var quotaLeft = MailApp.getRemainingDailyQuota();

  if((lr-1) > quotaLeft) {
    Browser.msgBox("You have " + quotaLeft + " left and you're trying to send" (lr-1) + " emails. Emails were not sent")
  } else {

    for (var i = 2;i<=lr;i++){  // i is the current row so in this i is row 2 

    var currentEmail = ss.getRange(i,12).getValue(); // 15 is the email column  
    var currentStudent = ss.getRange(i, 4).getValue(); // 4 is student name column
    var currentMessage = ss.getRange(i, 2).getValue(); // 2 is the message column
    var currentMissingAssingment = ss.getRange(i, 9).getValue(); // 9 is the missing assingment column

    var massageBody = templateText.replace("<<Student Name>>",currentStudent).replace("<<Message>>",currentMessage).replace("<<Missing Assingment>>",currentMissingAssingment);
    var subjectLine = currentStudent +" Has Homework Hour"; // change whats in the "" to what you need the subject on the email to be

   MailApp.sendEmail(currentEmail, currentStudent, massageBody); // to change subject on email change "Has Homework Hour" Part//

   } 
  }
 }

函数SendCoachEmails（）{ SpreadsheetApp.getActiveSpreadsheet（）.getSheetByName（“家庭作业小时4.0”）.activate（）；//当完成文本输入时，请关闭4.0 var ss=SpreadsheetApp.getActiveSpreadsheet（）.getActiveSheet（）； var lr=ss.getLastRow（）； var templateText=SpreadsheetApp.getActiveSpreadsheet（）.getSheetByName（“不要删除！父电子邮件模板”）.getRange（1，1）.getValue（）； var quotaLeft=MailApp.getRemainingDailyQuota（）； 如果（（lr-1）>quotaLeft）{ msgBox（“您还剩下“+quotaLeft+”并且您正在尝试发送”（lr-1）+“电子邮件。未发送电子邮件”） }否则{

---

对于（var i=2；i，您可以使用一个简单的条件声明，即在发送之前检查是否有电子邮件

if (currentEmail.trim() !== '')// check if email is not blank
   MailApp.sendEmail(currentEmail, currentStudent, massageBody); // to change subject on email change "Has Homework Hour" Part//
}