bugfix: reduce error logs when download home dir not exist

[starnop]

…me dir not exist

Signed-off-by: Starnop [email protected]

Ⅰ. Describe what this PR did

At present, gc disk will produce error logs continuously when download home dir not exist. And in this case, there is no need to do the gc job. So just return directly in this PR.

Ⅱ. Does this pull request fix one issue?

NONE.

Ⅲ. Why don't you add test cases (unit test/integration test)? (你真的觉得不需要加测试吗？)

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-io]

Codecov Report

Merging #960 into master will decrease coverage by 0.04%.
The diff coverage is 16.66%.

@@            Coverage Diff             @@
##           master     #960      +/-   ##
==========================================
- Coverage   46.46%   46.42%   -0.05%     
==========================================
  Files         116      116              
  Lines        6910     6910              
==========================================
- Hits         3211     3208       -3     
- Misses       3441     3445       +4     
+ Partials      258      257       -1

Impacted Files	Coverage Δ
supernode/daemon/mgr/cdn/cdn_gc.go	0% <0%> (ø)	⬆️
supernode/daemon/mgr/cdn/cache_detector.go	7.24% <0%> (ø)	⬆️
supernode/store/local_storage.go	62.94% <100%> (ø)	⬆️
cmd/dfdaemon/app/root.go	63.29% <0%> (-3.38%)	⬇️
supernode/daemon/mgr/scheduler/manager.go	22.6% <0%> (+0.68%)	⬆️

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[lowzj]

LGTM