Panic when read an empty parquet file

[Liyixin95]

Describe the bug

To Reproduce

first, create an empty parquet file using pandas

  import pandas as pd

  df = pd.DataFrame().reset_index(drop=True)
  df.to_parquet("./test.parquet")

then, read this parquet using rust:

  let file = File::open("./test.parquet")?;
  let reader = SerializedFileReader::new(file)?;

  let iter = reader.get_row_iter(None)?;
  for record in iter {
      println!("{:?}", record);
  }

and the program paniced:

thread 'main' panicked at D:\env\rust\.cargo\registry\src\rsproxy.cn-8f6827c7555bfaf8\parquet-50.0.0\src\schema\types.rs:1088:78:
called `Option::unwrap()` on a `None` value
stack backtrace:
   0: std::panicking::begin_panic_handler
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library\std\src\panicking.rs:645
   1: core::panicking::panic_fmt
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library\core\src\panicking.rs:72
   2: core::panicking::panic
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library\core\src\panicking.rs:127
   3: enum2$<core::option::Option<parquet::format::Type> >::unwrap<parquet::format::Type>
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112\library\core\src\option.rs:931
   4: parquet::schema::types::from_thrift_helper
             at D:\env\rust\.cargo\registry\src\rsproxy.cn-8f6827c7555bfaf8\parquet-50.0.0\src\schema\types.rs:1088
   5: parquet::schema::types::from_thrift
             at D:\env\rust\.cargo\registry\src\rsproxy.cn-8f6827c7555bfaf8\parquet-50.0.0\src\schema\types.rs:1035
   6: parquet::file::footer::decode_metadata
             at D:\env\rust\.cargo\registry\src\rsproxy.cn-8f6827c7555bfaf8\parquet-50.0.0\src\file\footer.rs:74
   7: parquet::file::footer::parse_metadata<std::fs::File>
             at D:\env\rust\.cargo\registry\src\rsproxy.cn-8f6827c7555bfaf8\parquet-50.0.0\src\file\footer.rs:65
   8: parquet::file::serialized_reader::SerializedFileReader<std::fs::File>::new<std::fs::File>
             at D:\env\rust\.cargo\registry\src\rsproxy.cn-8f6827c7555bfaf8\parquet-50.0.0\src\file\serialized_reader.rs:182
   9: parquet_test::read_parquet_file<ref$<str$> >
             at .\src\main.rs:9
  10: parquet_test::main
             at .\src\main.rs:29
  11: core::ops::function::FnOnce::call_once<void (*)(),tuple$<> >
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112\library\core\src\ops\function.rs:250
  12: core::hint::black_box
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112\library\core\src\hint.rs:286
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
error: process didn't exit successfully: `target\debug\parquet_test.exe` (exit code: 101)

Expected behavior

Additional context

[tustvold]

The issue appears to be that the logic currently assumes that a type with no children is a primitive type, when it should probably also check that it contains a set type_ field.

[tustvold]

label_issue.py automatically added labels {'parquet'} from #5322