Selecting location fails for entries created out of pad directive

[tarioch]

If you have pad statements, the location query doesn't work as the meta is missing

If you have something like

2024-01-01 open Assets:Foo
2024-01-01 open Income:Bar
2024-01-01 open Equity:Clear

2024-01-02 * "Add something"
    Assets:Foo  1 CHF
    Income:Bar

2024-01-03 pad Assets:Foo Equity:Clear
2024-01-04 balance Assets:Foo                         0 CHF

and run a query like

select account, location

It results in

  File "/workspace/.venv/lib/python3.10/site-packages/beanquery/query_env.py", line 1039, in location
    return '{:s}:{:d}:'.format(meta['filename'], meta['lineno'])
KeyError: 'filename'

this used to work on beancount 2

[dnicolodi]

This bug had something familiar to it... And indeed I fixed it once already beancount/beancount#767 And a fix for generating transactions with metadata went into beancount v2 beancount/beancount#768 but apparently it never made into beancount v3

I'll add another work-around for this in beanquery.