Fix read disk_cache not existed remove cache key

[lidaohang]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1677 (6177449) into main (b4f2d4a) will increase coverage by 0.17%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1677      +/-   ##
==========================================
+ Coverage   61.54%   61.72%   +0.17%     
==========================================
  Files         134      134              
  Lines       22645    22648       +3     
==========================================
+ Hits        13937    13979      +42     
+ Misses       7135     7098      -37     
+ Partials     1573     1571       -2     

Impacted Files	Coverage Δ
pkg/chunk/disk_cache.go	79.85% <100.00%> (-0.35%)	⬇️
pkg/chunk/utils_unix.go	73.33% <0.00%> (-20.00%)	⬇️
pkg/meta/sql_lock.go	72.07% <0.00%> (-2.60%)	⬇️
pkg/meta/sql.go	67.08% <0.00%> (-0.11%)	⬇️
pkg/chunk/cached_store.go	76.14% <0.00%> (+0.33%)	⬆️
pkg/meta/base.go	72.41% <0.00%> (+0.50%)	⬆️
pkg/vfs/reader.go	84.67% <0.00%> (+7.48%)	⬆️
pkg/fuse/context.go	67.56% <0.00%> (+10.81%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b4f2d4a...6177449. Read the comment docs.