Send Email with Inline Image AND text in body - google-apps-script

Question

I'm using this code to send emails that include an inline image and some text (both fetched from a sheets tab). The script runs well but the debug is not clean. Could you please help me find a better syntax?
The error I get is:
"Unexpected error while getting the method or property getBlob on
object DriveApp.File."
Thank you
function sendEmails() {
var ss = SpreadsheetApp.getActive().getSheetByName('SendMail')
var lr = ss.getLastRow();
var quotaLeft = MailApp.getRemainingDailyQuota();
//Logger.log(quotaLeft);
if((lr-1) > quotaLeft) {
Browser.msgBox("You have " + quotaLeft + " left and you're trying to send " + (lr-1) + " emails. Emails were not send.");
} else {
for (var i = 2;i<=lr;i++){
var currentEmail = ss.getRange(i, 1).getValue();
var currentSubject = ss.getRange(i, 2).getValue();
var templateText = ss.getRange(i, 3).getValue();
var currentname = ss.getRange(i, 4).getValue();
var reply = ss.getRange(i, 5).getValue();
var image = DriveApp.getFileById(ss.getRange(i, 6).getValue()).getBlob();
var message = templateText.replace("{name}",currentname);
message += "<br/><br/><img src=\"cid:sampleImage\">";
//Logger.log(currentEmail);
MailApp.sendEmail({
to: currentEmail,
replyTo: reply,
subject: currentSubject,
htmlBody: message,
inlineImages: {sampleImage: image},
});
} //close for loop
} //close else statement
} //close sendEmails`

Answer 1

The error means:
No item with the given ID could be found, or you do not have permission to access it.
Or in other words:
ss.getRange(i, 6).getValue() does not contain a valid file ID.
For debugging purposes add the following two logs before retrieving the image and observe the results:
...
Logger.log("Cell: " + ss.getRange(i, 6).getA1Notation());
Logger.log("Image: "+ DriveApp.getFileById(ss.getRange(i, 6).getValue()));
var image = DriveApp.getFileById(ss.getRange(i, 6).getValue()).getBlob();
...
How to make sure the cell containing the image ID is not empty?
Implement an if statement verifying if the cell is blank. If so, continue with the next loop iteration:
...
if(ss.getRange(i, 6).isBlank()){
continue;
}
var image = DriveApp.getFileById(ss.getRange(i, 6).getValue()).getBlob();
...