load should handle case where database tables already exist #6

% sqlite-diffable load simonwillisonblog.db simonwillisonblog
Traceback (most recent call last):
  File "/Users/simon/.local/share/virtualenvs/sqlite-diffable-J1UjzcIN/bin/sqlite-diffable", line 33, in <module>
    sys.exit(load_entry_point('sqlite-diffable', 'console_scripts', 'sqlite-diffable')())
  File "/Users/simon/.local/share/virtualenvs/sqlite-diffable-J1UjzcIN/lib/python3.10/site-packages/click/core.py", line 1130, in __call__
    return self.main(*args, **kwargs)
  File "/Users/simon/.local/share/virtualenvs/sqlite-diffable-J1UjzcIN/lib/python3.10/site-packages/click/core.py", line 1055, in main
    rv = self.invoke(ctx)
  File "/Users/simon/.local/share/virtualenvs/sqlite-diffable-J1UjzcIN/lib/python3.10/site-packages/click/core.py", line 1657, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/Users/simon/.local/share/virtualenvs/sqlite-diffable-J1UjzcIN/lib/python3.10/site-packages/click/core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/Users/simon/.local/share/virtualenvs/sqlite-diffable-J1UjzcIN/lib/python3.10/site-packages/click/core.py", line 760, in invoke
    return __callback(*args, **kwargs)
  File "/Users/simon/Dropbox/Development/sqlite-diffable/sqlite_diffable/cli.py", line 90, in load
    db.execute(schema)
  File "/Users/simon/.local/share/virtualenvs/sqlite-diffable-J1UjzcIN/lib/python3.10/site-packages/sqlite_utils/db.py", line 465, in execute
    return self.conn.execute(sql)
sqlite3.OperationalError: table "blog_entry" already exists