try/catch did not catch error in google sheet - try-catch

Question

I try the code to detect hidden row by Esquinas ( http://gist.github.com/esquinas/bdc8de88a41f08cc128f00341857b0e5) which use a try/catch approach.
function myfunction(){
var sheet = SpreadsheetApp.getActiveSheet();
var result = isRowHidden(sheet.getRange("A2"));
Logger.log(result);
}
function isRowHidden (row, optionalSheet) {
var ss = SpreadsheetApp.getActive()
var sheet = optionalSheet || ss.getActiveSheet()
SpreadsheetApp.setActiveSheet(sheet)
var dup = ss.duplicateActiveSheet()
SpreadsheetApp.setActiveSheet(sheet)
var isHidden = false
var rowIndex = row.getRow()
var numRows = dup.getMaxRows()
if (numRows === 1) {
ss.deleteSheet(dup)
return false
}
try {
if (rowIndex === numRows ) {
dup.hideRows(1, numRows - 1)
} else if (rowIndex === 1) {
dup.hideRows(rowIndex + 1, numRows - 1)
} else {
dup.hideRows(1, rowIndex - 1)
dup.hideRows(rowIndex + 1, numRows - rowIndex)
}
isHidden = false
} catch (err) {
Logger.log("There is error: " + err.message)
isHidden = true
} finally {
Logger.log("finall");
ss.deleteSheet(dup)
}
return isHidden
}
I created a sheet with 3 rows and hide the 2nd row. However, the error could not be caught. This is the result I got and I can't figure out the problem
Execution log
11:28:25 AM Notice Execution started
11:28:26 AM Error
Exception: You can't hide all the rows on the sheet.
isRowHidden # test.gs:37
myfunction # test.gs:4