`pretty_table` throws `MethodError: length(::Nothing)` for large matrices when `show_column_labels=false`

[abcdvvvv]

Hi, PrettyTables developers,

Minimal repro

using PrettyTables

# OK
pretty_table(ones(3, 3); show_column_labels = false)

# ERROR
pretty_table(rand(500, 500); show_column_labels = false)

Expected
Render a table normally, without error.

Actual
For large matrices (e.g., 500×500), it errors with:

ERROR: MethodError: no method matching length(::Nothing)
Stacktrace:
  [1] _text__print_table(pspec::PrettyTables.PrintingSpec; …, table_format::TextTableFormat)
    @ PrettyTables ~/.julia/packages/PrettyTables/.../src/backends/text/text_backend.jl:518

Small tables (e.g., 3×3) work.

Environment

• Julia 1.10.10 (Windows, juliaup mingw)
• PrettyTables v3.0.8
• Plain REPL / VS Code terminal

[ronisbr]

Thanks @abcdvvvv !

It should be fixed in master. I will tag a new version now.