Blind fix for NPE in WPP on Android Go.

The stacktrace in the associated bug reads:
NullPointerException [...] CoroutineContext.get [...] on a null object reference. In this case, our mainDispatcher is null; which leads to the hypothesis that the CustomizationProvider isn't being field-injected on Android Go.

Bug: 284002526
Change-Id: I06224f03e8306e5e9b0428eeffe6ff17bada86c2
Test: tested that no harm was done to WPP running with sysuig on Panther