cmd/utils: fix a startup issue on deleted chaindata but dangling anci…

[ucwong]

No description provided.

[codecov]

Codecov Report

Merging #1689 (381711e) into master (7984ab1) will increase coverage by 0.02%.
Report is 3 commits behind head on master.
The diff coverage is 0.00%.

❗ Current head 381711e differs from pull request most recent head 9f30a11. Consider uploading reports for the commit 9f30a11 to get more accurate results

@@            Coverage Diff             @@
##           master    #1689      +/-   ##
==========================================
+ Coverage   52.55%   52.57%   +0.02%     
==========================================
  Files         481      481              
  Lines       60275    60275              
==========================================
+ Hits        31676    31692      +16     
+ Misses      26186    26168      -18     
- Partials     2413     2415       +2     

Files Changed	Coverage Δ
core/blockchain.go	22.81% <0.00%> (ø)
core/rawdb/database.go	9.49% <0.00%> (ø)

... and 11 files with indirect coverage changes