[RavSinghChandan]

A content stream with a bare Do operator, as in

BT /F1 12 Tf (Hello) Tj ET Do BT /F1 12 Tf (World) Tj ET

makes extract_text() raise "IndexError: list index out of range". The call into
_extract_text__xform fails without an operand, and the warning in the except
block reads operands[0] again.

A Do without an operand is now skipped, as the image extraction loop in the same
file already does (elif ope == b"Do" and param:), and as TD and " are guarded
just above. The text around it is kept: the example extracts as "HelloWorld".

Full suite passes locally, 1875 tests.

Used Claude Code (Claude Opus 5.5) to help find and patch this and to draft this description; I reviewed and tested the change.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.12%. Comparing base (3ecbbc5) to head (d34c61b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4165      +/-   ##
==========================================
- Coverage   98.12%   98.12%   -0.01%     
==========================================
  Files          59       59              
  Lines       11604    11603       -1     
  Branches     2176     2176              
==========================================
- Hits        11387    11386       -1     
  Misses        123      123              
  Partials       94       94              

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