check LifeWindow when CleanWindow is set

[chenyahui]

When set CleanWindow, if LifeWindow isn't set, any data you put in will be wiped out right away. So, we need to add a check to prevent this.

[codecov-commenter]

Codecov Report

Merging #386 (75e0f55) into main (93a748a) will decrease coverage by 0.72%.
The diff coverage is 50.00%.

❗ Current head 75e0f55 differs from pull request most recent head b7f5077. Consider uploading reports for the commit b7f5077 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #386      +/-   ##
==========================================
- Coverage   89.16%   88.45%   -0.72%     
==========================================
  Files          15       15              
  Lines         794      797       +3     
==========================================
- Hits          708      705       -3     
- Misses         73       77       +4     
- Partials       13       15       +2     

Files	Coverage Δ
bigcache.go	91.60% <50.00%> (-1.37%)	⬇️

... and 1 file with indirect coverage changes

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