parse_for_liquid_tag errors without line numbers

While adding some nested liquid tag test cases to the golden liquid test suite, I was getting errors like this:

  1) Error:
Golden::liquid.golden.liquid_tag#test_0001_bare liquid tag in liquid tag:
NoMethodError: undefined method `-' for nil:NilClass

            parse_context.line_number -= 1
                                      ^
    /home/james/.rbenv/versions/3.1.4/lib/ruby/gems/3.1.0/bundler/gems/liquid-5e92b3a89a11/lib/liquid/block_body.rb:50:in `parse_for_liquid_tag'
    /home/james/.rbenv/versions/3.1.4/lib/ruby/gems/3.1.0/bundler/gems/liquid-5e92b3a89a11/lib/liquid/block_body.rb:111:in `parse_liquid_tag'
    /home/james/.rbenv/versions/3.1.4/lib/ruby/gems/3.1.0/bundler/gems/liquid-5e92b3a89a11/lib/liquid/block_body.rb:145:in `parse_for_document'
    /home/james/.rbenv/versions/3.1.4/lib/ruby/gems/3.1.0/bundler/gems/liquid-5e92b3a89a11/lib/liquid/block_body.rb:29:in `parse'
    /home/james/.rbenv/versions/3.1.4/lib/ruby/gems/3.1.0/bundler/gems/liquid-5e92b3a89a11/lib/liquid/document.rb:55:in `parse_body'
    /home/james/.rbenv/versions/3.1.4/lib/ruby/gems/3.1.0/bundler/gems/liquid-5e92b3a89a11/lib/liquid/document.rb:23:in `parse'
    /home/james/.rbenv/versions/3.1.4/lib/ruby/gems/3.1.0/bundler/gems/liquid-5e92b3a89a11/lib/liquid/document.rb:7:in `parse'
    /home/james/.rbenv/versions/3.1.4/lib/ruby/gems/3.1.0/bundler/gems/liquid-5e92b3a89a11/lib/liquid/template.rb:111:in `parse'
    /home/james/.rbenv/versions/3.1.4/lib/ruby/gems/3.1.0/bundler/gems/liquid-5e92b3a89a11/lib/liquid/template.rb:97:in `parse'
    golden_liquid.rb:25:in `block (5 levels) in <main>'

Adding line_numbers: true to Liquid::Template.parse solved the problem.

This is can be reproduced with the following:

require 'liquid'

template = <<~LIQUID
{%- liquid
    liquid
    echo 'foo'
-%}
LIQUID

Liquid::Template.parse(template).render!()

Start with lib/liquid/block_body.rb at parse_for_liquid_tag and follow how Liquid::Template.parse initializes parsing context line numbers. Run the minimal nested liquid-tag reproduction with and without line_numbers: true. Done means the reproduction no longer raises NoMethodError when line numbers are not enabled, while preserving line-number behavior when they are.