Can't use compare report function.

[hansyuanyang]

Hi, thanks for making this amazing tool. There's a ZeroDivisionError when I use compare function:

`192.168.26.12 - - [30/May/2023 10:56:26] "GET /apm/log?scene=apm_2023-05-30-10-22-11&target=battery&platform=iOS&=1685415386190 HTTP/1.1" 200 -
192.168.26.12 - - [30/May/2023 10:56:26] "GET /apm/log?scene=apm_2023-05-30-10-22-11&target=flow&platform=iOS&=1685415386191 HTTP/1.1" 200 -

[2023-05-30 10:56:33,272] ERROR in app: Exception on /compare_analysis [GET]
Traceback (most recent call last):
File "E:\MyWorkFolder\DWM\Profiling\SoloX\SoloX_evn01\lib\site-packages\flask\app.py", line 2073, in wsgi_app
response = self.full_dispatch_request()
File "E:\MyWorkFolder\DWM\Profiling\SoloX\SoloX_evn01\lib\site-packages\flask\app.py", line 1519, in full_dispatch_request
rv = self.handle_user_exception(e)
File "E:\MyWorkFolder\DWM\Profiling\SoloX\SoloX_evn01\lib\site-packages\flask\app.py", line 1517, in full_dispatch_request
rv = self.dispatch_request()
File "E:\MyWorkFolder\DWM\Profiling\SoloX\SoloX_evn01\lib\site-packages\flask\app.py", line 1503, in dispatch_request
return self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args)
File "E:\MyWorkFolder\DWM\Profiling\SoloX\SoloX_evn01\lib\site-packages\solox\view\pages.py", line 176, in analysis_compare
apm_data1 = f._setiOSPerfs(scene1)
File "E:\MyWorkFolder\DWM\Profiling\SoloX\SoloX_evn01\lib\site-packages\solox\public\common.py", line 555, in _setiOSPerfs
cpuAppRate = f'{round(sum(cpuAppData) / len(cpuAppData), 2)}%'
ZeroDivisionError: division by zero

192.168.26.12 - - [30/May/2023 10:56:33] "GET /compare_analysis?app=com.nexon.dwm.inhouse&scene1=apm_2023-05-30-10-22-11&scene2=apm_2023-05-30-10-47-44&platform=iOS&lan=None HTTP/1.1" 500 -
192.168.26.12 - - [30/May/2023 10:56:33] "GET /static/css/tabler.min.css HTTP/1.1" 304 -
192.168.26.12 - - [30/May/2023 10:56:33] "GET /static/css/select2-bootstrap-5-theme.min.css HTTP/1.1" 304 -`