[sarankumar1325]

Fixes #651

GNU sed skips blanks between the + of an addr1,+N range and its number, and reads a missing number as 0. uutils sed failed both with number expected:

$ seq 4 | sed '2,+ 1d'   # GNU: 1 4
$ seq 4 | sed '2,+d'     # GNU: 1 3 4

compile_address now skips blanks after + and parses the number as optional, defaulting to 0. 2,+1d is unchanged.

It uses the existing eat_spaces, like the rest of the address parser, so it follows whatever #654 decides about which blanks count.

Tests:

• integration test_relative_range_blank_or_missing_number (space, tab, missing number, plain +1; fails on main)
• unit test_compile_addr_relative_line_blank_and_missing_number in compiler.rs
• cargo test, cargo fmt --check and cargo clippy --all-targets -- -D warnings pass locally

I used an AI assistant (Grok Bot) to help write this change. I reviewed the diff, compared the behaviour with GNU sed 4.9 on my machine and ran the tests above.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.25%. Comparing base (5e2821e) to head (d74ba6e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #662   +/-   ##
=======================================
  Coverage   95.24%   95.25%           
=======================================
  Files          14       14           
  Lines        7490     7500   +10     
  Branches      442      442           
=======================================
+ Hits         7134     7144   +10     
  Misses        355      355           
  Partials        1        1           

Flag	Coverage Δ
macos_latest	96.74% <100.00%> (+<0.01%)	⬆️
ubuntu_latest	96.68% <100.00%> (+<0.01%)	⬆️
windows_latest	0.00% <0.00%> (ø)

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