On Fedora 22, Holland fails with Python error

[Danny Attar]

At Fedora 22, it seems that Python 2.7 is stricter about the syntax for single-element tuples.
Using the mysqldump plugin and Holland 1.0.10-3.fc22, the result was:

Uncaught exception while running command 'bk': TypeError('not all arguments converted during string formatting',)
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/holland/core/command/command.py", line 209, in dispatch
    return self.run(self.optparser.prog, opts, *args)
  File "/usr/lib/python2.7/site-packages/holland/commands/backup.py", line 102, in run
    runner.backup(name, config, opts.dry_run)
  File "/usr/lib/python2.7/site-packages/holland/core/backup/base.py", line 120, in backup
    estimated_size = self.check_available_space(plugin, spool_entry, dry_run)
  File "/usr/lib/python2.7/site-packages/holland/core/backup/base.py", line 213, in check_available_space
    estimated_bytes_required = plugin.estimate_backup_size()
  File "/usr/lib/python2.7/site-packages/holland/backup/mysqldump/plugin.py", line 123, in estimate_backup_size
    self.schema.refresh(db_iter=db_iter, tbl_iter=tbl_iter)
  File "/usr/lib/python2.7/site-packages/holland/lib/mysql/schema/base.py", line 135, in refresh
    for table in tbl_iter(database.name):
  File "/usr/lib/python2.7/site-packages/holland/lib/mysql/schema/base.py", line 293, in __call__
    for metadata in self.client.show_table_metadata(database):
  File "/usr/lib/python2.7/site-packages/holland/lib/mysql/client/base.py", line 198, in show_table_metadata
    return self._show_table_metadata51(database)
  File "/usr/lib/python2.7/site-packages/holland/lib/mysql/client/base.py", line 181, in _show_table_metadata51
    cursor.execute(sql, (database))
  File "/usr/lib64/python2.7/site-packages/MySQLdb/cursors.py", line 202, in execute
    query = query % args
TypeError: not all arguments converted during string formatting

Changing line 181 of /usr/lib/python2.7/site-packages/holland/lib/mysql/client/base.py from:

        cursor.execute(sql, (database))

to:

         cursor.execute(sql, (database,))

fixes the problem.