Do not reset an option that has no reset method
Do not reset an option that has no reset method

The placeholder method has no reset, skip it when resetting the
options.

Change-Id: I4936c5c9dde870b574b035384abcdf0b746d9b4a

wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo