Fix isUnset

[TsinghuaDream]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.62%. Comparing base (5f4bdeb) to head (cc658f7).

Files with missing lines	Patch %	Lines
php/src/Utils.php	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #363   +/-   ##
=========================================
  Coverage     82.62%   82.62%           
  Complexity      249      249           
=========================================
  Files            23       23           
  Lines          2435     2435           
  Branches        118      118           
=========================================
  Hits           2012     2012           
  Misses          399      399           
  Partials         24       24           

Flag	Coverage Δ
csharp	97.75% <ø> (ø)
golang	91.70% <ø> (ø)
java	69.62% <ø> (ø)
php	0.00% <0.00%> (ø)
python	98.63% <ø> (ø)
ts	96.11% <ø> (ø)

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