当数据库为空时，它应该命中第一个if条件并返回错误，但由于某种原因，它会执行其余部分。即使我注解掉if语句后的所有代码，它也会执行所有代码并返回ICS文件。
不知何故，if之后的其余代码被保存在其他地方，或者ICS文件被存储在某个地方，每次都被返回。

from flask import Flask, request, Response, send_file, make_response
from flask_restx import Api, Resource, fields, reqparse
from ics import Calendar, Event

@api.route('/calendar')
class ICSCalendar(Resource):

    @api.response(200, 'Successfully Retrieved Calendar')
    @api.response(404, 'No Events Found')
    @api.doc(description="Get all events in an ``ICS`` calendar format")
    def get(self):
        '''Get all events in an ICS calendar format'''
        events = execute_query("SELECT * FROM events")
        print(events)
        if not events:
            return {"Error": "No events found"}, 404
        cal = Calendar()
        for row in events:
            event = Event()
            event.name = row[1]
            event.begin = pytz.timezone('Australia/Sydney').localize(datetime.combine(datetime.strptime(row[2], '%Y-%m-%d').date(), datetime.strptime(row[3], '%H:%M:%S').time()))
            event.end = pytz.timezone('Australia/Sydney').localize(datetime.combine(datetime.strptime(row[2], '%Y-%m-%d').date(), datetime.strptime(row[4], '%H:%M:%S').time()))
            event.location = f"{row[5]}, {row[6]}, {row[7]} {row[8]}"
            event.description = row[9]
            event.last_modified = pytz.utc.localize(datetime.strptime(row[10], '%Y-%m-%d %H:%M:%S'))
            cal.events.add(event)

        # Write the ICS data to an in-memory buffer
        buffer = StringIO(cal.serialize(), newline=None)
        buffer.seek(0)
        # Create a response with the ICS data as an attachment
        response = make_response(send_file(buffer, as_attachment=True, attachment_filename='calendar.ics', mimetype='text/calendar'))
        response.headers['Content-Disposition'] = 'attachment; filename=calendar.ics'
        buffer.truncate(0)
        return response`

@api.route('/calendar')
class ICSCalendar(Resource):

    @api.response(200, 'Successfully Retrieved Calendar')
    @api.response(404, 'No Events Found')
    @api.doc(description="Get all events in an ``ICS`` calendar format")
    def get(self):
        '''Get all events in an ICS calendar format'''
        events = execute_query("SELECT * FROM events")
        print(events)
        if not events:
            return {"Error": "No events found"}, 404

我把数据库设置为空，只使用上面的代码，但它返回一个ICS文件。
我只希望它在事件中有内容时返回ICS文件。
有没有人知道为什么这是返回ICS数据时，它不应该？