object/b2: fix b2 get empty file info

[zhijian-pro]

ref #3272

TestB2

=== RUN   TestB2
    object_storage_test.go:87: PUT testEncodeFile failed: bad_request: File names must not contain unicode characters with codes less than 32
    object_storage_test.go:340: b2://zhijian-dev/unit-test/ does not support multipart upload: not supported
    object_storage_test.go:357: delete slash/ failed range_not_satisfiable: byte range bytes=0-1 for a file of length 0
    object_storage_test.go:346: delete empty file failed: range_not_satisfiable: byte range bytes=0-1 for a file of length 0
--- PASS: TestB2 (124.78s)

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.03 🎉

Comparison is base (bfcf95f) 55.35% compared to head (f9d5cd9) 55.39%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3274      +/-   ##
==========================================
+ Coverage   55.35%   55.39%   +0.03%     
==========================================
  Files         142      142              
  Lines       33340    33347       +7     
==========================================
+ Hits        18456    18471      +15     
+ Misses      12926    12922       -4     
+ Partials     1958     1954       -4     

Impacted Files	Coverage Δ
pkg/object/b2.go	1.66% <0.00%> (-0.09%)	⬇️
pkg/object/obs.go	0.74% <0.00%> (-0.01%)	⬇️
pkg/fuse/context.go	65.85% <0.00%> (-7.32%)	⬇️
pkg/vfs/handle.go	83.58% <0.00%> (-0.75%)	⬇️
pkg/meta/sql.go	58.70% <0.00%> (-0.36%)	⬇️
pkg/meta/redis.go	66.19% <0.00%> (+0.03%)	⬆️
pkg/chunk/disk_cache.go	73.25% <0.00%> (+0.43%)	⬆️
pkg/vfs/writer.go	78.65% <0.00%> (+1.16%)	⬆️
pkg/vfs/reader.go	79.27% <0.00%> (+3.32%)	⬆️

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