optimize: 优化无签名时错误提示

[yansongda]

fix: #811

[netlify]

✅ Deploy Preview for pay-yansongda canceled.

Name	Link
🔨 Latest commit	5b2e14a
🔍 Latest deploy log	https://app.netlify.com/sites/pay-yansongda/deploys/6496da08c220bf00085ffda3

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (4408ee8) 89.31% compared to head (5b2e14a) 89.31%.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #813   +/-   ##
=========================================
  Coverage     89.31%   89.31%           
  Complexity      763      763           
=========================================
  Files           220      220           
  Lines          2685     2685           
=========================================
  Hits           2398     2398           
  Misses          287      287           

Impacted Files	Coverage Δ
src/Functions.php	94.65% <0.00%> (ø)

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