ROB: Guard text operators against missing operands in extract_text

[metsw24-max]

Crash on text operators with missing operands

A malformed content stream whose ", TD, Td or Tf operator supplies fewer operands than the operator needs makes extract_text() raise an uncaught IndexError (the " case can also surface as a ValueError), because the operands are read by fixed index with no arity check. Guarded each access where it is read so a short operator is skipped or falls back to a zero translation, matching the if operands else handling already used on the neighbouring text-state operators.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.79%. Comparing base (41a9c3c) to head (a01bdc0).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3861   +/-   ##
=======================================
  Coverage   97.79%   97.79%           
=======================================
  Files          55       55           
  Lines       10509    10510    +1     
  Branches     1958     1958           
=======================================
+ Hits        10277    10278    +1     
  Misses        128      128           
  Partials      104      104           

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