Fix the error: 'SSDataManager' object has no attribute

[SimFG]

issue: #489

[sre-ci-robot]

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[codecov[bot]]

Codecov Report

Merging #501 (8709688) into dev (635dca5) will not change coverage. The diff coverage is 100.00%.

Additional details and impacted files

[](https://app.codecov.io/gh/zilliztech/GPTCache/pull/501?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zilliztech) ```diff @@ Coverage Diff @@ ## dev #501 +/- ## ======================================= Coverage 94.19% 94.19% ======================================= Files 94 94 Lines 3908 3908 ======================================= Hits 3681 3681 Misses 227 227 ``` | [Files Changed](https://app.codecov.io/gh/zilliztech/GPTCache/pull/501?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zilliztech) | Coverage Δ | | |---|---|---| | [gptcache/manager/data\_manager.py](https://app.codecov.io/gh/zilliztech/GPTCache/pull/501?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zilliztech#diff-Z3B0Y2FjaGUvbWFuYWdlci9kYXRhX21hbmFnZXIucHk=) | `89.50% <100.00%> (ø)` | |