fix(auto attendance): handling None case for IN/OUT Logs (#18867)

diff --git a/erpnext/hr/doctype/employee_checkin/employee_checkin.py b/erpnext/hr/doctype/employee_checkin/employee_checkin.py
index d7d6706..8670512 100644
--- a/erpnext/hr/doctype/employee_checkin/employee_checkin.py
+++ b/erpnext/hr/doctype/employee_checkin/employee_checkin.py
@@ -142,8 +142,10 @@
 
 	elif check_in_out_type == 'Strictly based on Log Type in Employee Checkin':
 		if working_hours_calc_type == 'First Check-in and Last Check-out':
-			first_in_log = logs[find_index_in_dict(logs, 'log_type', 'IN')]
-			last_out_log = logs[len(logs)-1-find_index_in_dict(reversed(logs), 'log_type', 'OUT')]
+			first_in_log_index = find_index_in_dict(logs, 'log_type', 'IN')
+			first_in_log = logs[first_in_log_index] if first_in_log_index or first_in_log_index == 0 else None
+			last_out_log_index = find_index_in_dict(reversed(logs), 'log_type', 'OUT')
+			last_out_log = logs[len(logs)-1-last_out_log_index] if last_out_log_index or last_out_log_index == 0 else None
 			if first_in_log and last_out_log:
 				in_time, out_time = first_in_log.time, last_out_log.time
 				total_hours = time_diff_in_hours(in_time, out_time)