Handle undefined 'commited' option in helper_plugin_move_plan

[bradbulger]

In the options property of helper_plugin_move_plan, the key 'commited' is not always defined. This causes undefined array key errors (in PHP 7.4, at least).

All the references are just checking if it is true or false, so it's easy enough to use empty() to avoid the issue.

[bradbulger]

Ah, no, my mistake. The key "committed" is initialized in loadOptions() - it just needs a spelling fix.

[dregad]

Getting this too, on Administration page (PHP 8)

Warning: Undefined array key "commited" in .../lib/plugins/move/helper/plan.php on line 201