[Bug] "Ask where to download" and bilibili video download error

[facaikotei]

Checklist (Your issue will be automatically closed if you delete this part)

• I make sure that there are no existing issues - open or closed - which I could contribute my information to.
• I understand that issues with limited impact, such as those occurring on specific devices or under specific network conditions, will not be fixed.
• I am able to reproduce the bug with the latest version given here: CLICK THIS LINK.
• I have attached the error report in the issue.

Describe the bug
A "post-processing failed" occurs when download bilibili video if "Ask where to download" is enabled.
Frequency
Always
Steps to reproduce the bug
Enable "Ask where to download".
Download a bilibili video.
Download failed.
Device (e.g. Pixel 9 Pro)
Samsung galaxy s22
Error report

Exception

• User Action: download post-processing
• Request: https://bilibili.com/BV1VJkZYeEm3?p=1 [ {type=video format=MPEG-4 quality=720P 高清 videoOnly=true} {type=audio format=m4a bitrate=-1} ]
• Content Country: TW
• Content Language: zh-TW
• App Language: zh_TW_#Hant
• Service: BiliBili
• Version: 4.0.2
• OS: Linux Android 14 - 34

Crash log

java.lang.NullPointerException: Attempt to invoke virtual method 'java.io.File[] java.io.File.listFiles()' on a null object reference
	at us.shandian.giga.util.Utility.removeTempFileOfDownloadedVideo(Utility.java:347)
	at us.shandian.giga.postprocessing.Postprocessing.run(Postprocessing.java:213)
	at us.shandian.giga.get.DownloadMission.doPostprocessing(DownloadMission.java:706)
	at us.shandian.giga.get.DownloadMission.$r8$lambda$J0GR1urTFneOp2O30GpOM3TNG0I(Unknown Source:0)
	at us.shandian.giga.get.DownloadMission$$ExternalSyntheticLambda0.run(Unknown Source:2)
	at java.lang.Thread.run(Thread.java:1012)

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Additional context
#295 3.5.0 and #225 3.3.1 have same bug fixed and closed.
But in latest 4.0.2 version, it only "fixed" if "Ask where to download" is disable.

[InfinityLoop1308]

Fixed in the latest build.

[facaikotei]

Fixed in the latest build.

4.1.0, not fixed

[facaikotei]

Exception

• User Action: download post-processing
• Request: https://bilibili.com/BV1tsrPYqEb6?p=1 [ {type=video format=MPEG-4 quality=720P 高清 videoOnly=true} {type=audio format=m4a bitrate=-1} ]
• Content Country:
• Content Language: en-
• App Language: en
• Service: BiliBili
• Version: 4.1.0
• OS: Linux Android 14 - 34

Crash log

java.lang.NullPointerException: Attempt to invoke virtual method 'androidx.documentfile.provider.DocumentFile[] androidx.documentfile.provider.DocumentFile.listFiles()' on a null object reference
	at us.shandian.giga.util.Utility.removeTempFileOfDownloadedVideo(Utility.java:360)
	at us.shandian.giga.postprocessing.Postprocessing.run(Postprocessing.java:213)
	at us.shandian.giga.get.DownloadMission.doPostprocessing(DownloadMission.java:706)
	at us.shandian.giga.get.DownloadMission.$r8$lambda$J0GR1urTFneOp2O30GpOM3TNG0I(Unknown Source:0)
	at us.shandian.giga.get.DownloadMission$$ExternalSyntheticLambda0.run(Unknown Source:2)
	at java.lang.Thread.run(Thread.java:1012)

---

[facaikotei]

@InfinityLoop1308