[vim/vim] crash when building a stacktrace during an autocommand (PR #20732)

[h_east]

Problem:  Vim can crash while building a stack trace when an autocommand
          is being triggered but has not matched a pattern yet, for
          example at the more prompt with 'verbose' set.
Solution: Handle the autocommand entry on the execution stack that does
          not have a script context yet.

fixes: #20730

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You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/20732

Commit Summary

• 146ec43 crash when building a stacktrace during an autocommand

File Changes

(2 files)

• M src/scriptfile.c (21)
• M src/testdir/test_stacktrace.vim (55)

Patch Links:

• https://github.com/vim/vim/pull/20732.patch
• https://github.com/vim/vim/pull/20732.diff

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