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e39db36954
7z shows an empty CRC for empty files when generating an archive manifest:
```
▸ mkdir dir
▸ touch dir/empty
▸ echo foobar >dir/foobar
▸ 7z a test.7z dir
[…]
▸ 7z -ba h dir
dir
B22C9747 7 dir/foobar
00000000 0 dir/empty
▸ 7z -ba -slt l test.7z
Path = dir
Size = 0
Packed Size = 0
Modified = 2025-09-27 22:55:25.7947183
Attributes = D drwxr-xr-x
CRC =
Encrypted = -
Method =
Block =
Path = dir/empty
Size = 0
Packed Size = 0
Modified = 2025-09-27 22:43:34.0722990
Attributes = A -rw-r--r--
CRC =
Encrypted = -
Method =
Block =
Path = dir/foobar
Size = 7
Packed Size = 11
Modified = 2025-09-27 22:55:25.7947183
Attributes = A -rw-r--r--
CRC = B22C9747
Encrypted = -
Method = LZMA2:12
Block = 0
```
