ChangesListSpecialPage: Don't short-circuit the ChangesList, instead format zero...

ChangesListSpecialPage: Don't short-circuit the ChangesList, instead format zero rows

Short-circuiting the ChangesList causes bugs, because it causes
ChangesList::beginRecentChangesList() to be bypassed. This function
adds important styles and RL modules, especially when enhanced RC is enabled.

Instead, fake an empty result and let the ChangesList format it.
This will add styles and modules but otherwise produce no output.
(It does produce an empty div, but the idiosyncratic way in which the
subclasses deal with empty results causes that div not to be output.)

Bug: T169835
Change-Id: Ib831c781f4fe91eef787aef3d17e71780be9da51