[Regression] Crash when apply backup on certain devices about fennec-profile-manager HOT 4 CLOSED

This one is interesting..
Applying a backup means writing all the files from a .fpm in Fennec's internal storage
For this we first are to delete all said internal storage files
Using java.io.File.delete, recursive calls done here. Calls that for whatever reason fail on some devices.
Then when we are trying to copy the new files this call throws.
After further investigations I found that our "lib" directory seems to be a symlink. For which we might indeed not have the right permissions. :-?

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ref #42

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Waiting for a confirmation from QA that all looks good now.
Based on the stacktrace and my investigation this is beyond strange so most I could do is just ignore such an exception if

• the needed file exists
• is not empty
• we can't write to it
  All of the above should ensure that the file "should" be what the app needs and if based on the stracktrace and my findings this issue would only happen with app libs I think it's ok to ignore this issue in such cases.
  Otherwise the app would still crash giving us the possibility to investigate more the crash cause.

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Verified as fixed on FPM build 7, "apply" works as expected.
Devices:

• Motorola Moto G6 (Android 8.0),
• Huawei Honor 8 (Android 7.0),
• HTC Desire 820 (Android 6.0.1),
• Samsung Galaxy Tab A 6 (Android 5.1.1).

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