Parser crash on trailing whitespace in last posting line without amount

[JaGitJe]

When the last line of a posting has no explicit amount and ends with a trailing space, the plugin crashes with a nil node error.

Reproduction

account Ausgaben:Transport
account Aktiva:Girokonto

commodity 1000.00 EUR

2025-01-08 This Posting has trailing space in line 3 
    Ausgaben:Transport            EUR 49.00
    Aktiva:Girokonto 

2025-01-09 Monatskarte BVG
    Ausgaben:Transport            EUR 49.00
    Aktiva:Girokonto

Line 3 has a trailing space. Opening this file crashes immediately. Removing the space or adding an explicit amount prevents the crash.

Error

"test.journal" 12L, 289B written
Error detected while processing BufWritePost Autocommands for "*.journal":
Error executing lua callback: /usr/share/nvim/runtime/lua/vim/treesitter.lua:219: attempt to index local 'node' (a nil value)
stack traceback:
        /usr/share/nvim/runtime/lua/vim/treesitter.lua:219: in function 'get_node_text'
        ....local/share/nvim/lazy/ledger.nvim/lua/ledger/parser.lua:154: in function 'get_postings_from_source'
        ...local/share/nvim/lazy/ledger.nvim/lua/ledger/context.lua:70: in function 'add_file'
        ...ocal/share/nvim/lazy/ledger.nvim/lua/ledger/commands.lua:104: in function <...ocal/share/nvim/lazy/ledger.nvim/lua/ledger/commands.lua:100>

:InspectTree shows no ERROR nodes — tree-sitter parses the file fine. Looks like a missing nil check before get_node_text in parser.lua:154.

Environment

• Neovim v0.11.6, ledger.nvim v0.3.0, tree-sitter-ledger latest, Arch Linux