NullReferenceException with RarReader since 0.33

[IS4Code]

An error seems to have been introduced in 0.33 that affects reading some RAR archives using the RarReader.
Example RAR with the issue: https://telparia.com/fileFormatSamples/archive/rar/comment.rar
Even iterating through the archive throws an exception:

using var inputFile = File.Open("comment.rar", FileMode.Open);
var reader = RarReader.Open(inputFile);

while(reader.MoveToNextEntry()) ;

Exception:

   at SharpCompress.Common.Rar.RarVolume.<GetVolumeFileParts>d__11.MoveNext()
   at SharpCompress.Readers.Rar.RarReader.<GetEntries>d__13.MoveNext()
   at SharpCompress.Readers.AbstractReader`2.LoadStreamForReading(Stream stream)
   at SharpCompress.Readers.AbstractReader`2.MoveToNextEntry()

This works fine on 0.32.2, but does not work on 0.33 to 0.34.2.

[IS4Code]

0.35 fixed this issue, but there is another null-related one with https://telparia.com/fileFormatSamples/archive/rar/password.rar on IReader.MoveToNextEntry:

System.ArgumentNullException: String reference not set to an instance of a String. (Parameter 's')

  Stack Trace: 
    Encoding.GetBytes(String s)
    UTF8EncodingSealed.GetBytes(String s)
    CryptKey5.GenerateRarPBKDF2Key(String password, Byte[] salt, Int32 iterations, Int32 keyLength)
    CryptKey5.Transformer(Byte[] salt)
    RarCryptoWrapper.ctor(Stream actualStream, Byte[] salt, ICryptKey key)
    RarHeaderFactory.TryReadNextHeader(Stream stream)
    RarHeaderFactory.ReadHeaders(Stream stream)+MoveNext()
    RarVolume.GetVolumeFileParts()+MoveNext()
    RarReader.GetEntries(Stream stream)+MoveNext()
    AbstractReader`2.LoadStreamForReading(Stream stream)

[adamhathcock]

Looks like #798 will address