fix metrics null pointer exception

[tuohai666]

No description provided.

[codecov-commenter]

Codecov Report

Merging #313 (05a236a) into master (76fa013) will not change coverage.
The diff coverage is 0.00%.

@@          Coverage Diff           @@
##           master    #313   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files         369     369           
  Lines        6480    6478    -2     
  Branches     1109    1109           
======================================
+ Misses       6480    6478    -2     

Impacted Files	Coverage Δ
...hmily/core/interceptor/HmilyGlobalInterceptor.java	0.00% <0.00%> (ø)

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