chore: no success on time_notebook failure

use_case_examples/time_notebook_execution.sh

@@ -4,10 +4,22 @@ print_time_execution() {
     printf " - Notebook %s executed in %02dh:%02dm:%02ds\n" "$1" $(($2/3600)) $(($2%3600/60)) $(($2%60))
 }
 
+
 START=$(date +%s)
+
+set +e
 jupyter nbconvert --to notebook --inplace --execute "$1" 1>&2
+result=$?
+set -e
+
 END=$(date +%s)
 TIME_EXEC=$((END-START))
-print_time_execution "$1" ${TIME_EXEC}
 
+# Check the result of nbconvert execution
+if [ $result -ne 0 ]; then
+    echo "Error: nbconvert failed with status $result"
+    exit $result
+else
+    print_time_execution "$1" ${TIME_EXEC}
+fi