[ISSUE-3306] Fix FsPath null String

[aiceflower]

fix NPE problem #3306

[codecov]

Codecov Report

Merging #3307 (128270c) into dev-1.3.0 (779a445) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@               Coverage Diff               @@
##             dev-1.3.0    #3307      +/-   ##
===============================================
- Coverage        14.69%   14.68%   -0.01%     
  Complexity        1018     1018              
===============================================
  Files              677      677              
  Lines            23744    23746       +2     
  Branches          3541     3542       +1     
===============================================
  Hits              3488     3488              
- Misses           19740    19742       +2     
  Partials           516      516              

Impacted Files	Coverage Δ
.../main/java/org/apache/linkis/common/io/FsPath.java	0.00% <0.00%> (ø)

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[casionone]

LGTM