Fix NullPointerException of getExternalDocumentationUrl

[koxudaxi]

Closes: #773 #742

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (6b3e80a) 71.96% compared to head (5224ab3) 71.96%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #778   +/-   ##
=======================================
  Coverage   71.96%   71.96%           
=======================================
  Files          27       27           
  Lines        2037     2037           
  Branches      624      624           
=======================================
  Hits         1466     1466           
  Misses        273      273           
  Partials      298      298           

Files Changed	Coverage Δ
...daxi/pydantic/PydanticDocumentationLinkProvider.kt	0.00% <ø> (ø)

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[github-actions]

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