[ump45nose]

Summary

When a document declares %TAG !! … (secondary tag handle), parseTag always built a string node from the token after the tag. If that value is missing at EOF (for example a: !!str or - !!str), ctx.currentToken() is nil and newStringNode panics with a nil pointer dereference.

Without the directive, the same inputs already work: parseTagValue treats a nil token as an implicit null. This change mirrors that handling on the secondary-directive path and leaves the non-nil path unchanged.

Fixes #987

Test plan

• Added TestIssue987EmptyTaggedValueUnderSecondaryTagDirective covering the three inputs from the issue (mapping, sequence, document-level tag).
• go test -count=1 -run TestIssue987EmptyTaggedValueUnderSecondaryTagDirective .
• go test -count=1 -timeout 120s .
• go test -count=1 ./parser/

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Codecov Report

❌ Patch coverage is 60.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.67%. Comparing base (edee2f9) to head (4bf770e).
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #988      +/-   ##
==========================================
+ Coverage   80.65%   80.67%   +0.01%     
==========================================
  Files          22       22              
  Lines        6845     6851       +6     
==========================================
+ Hits         5521     5527       +6     
  Misses        905      905              
  Partials      419      419              

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