Digital PCT265 defect MVAPCT-272: Add throttle trigger to halt updates for first half second.

MVMCoreUI/BaseControllers/ViewController.swift

@@ -87,11 +87,12 @@ import Combine
                 let updates = (updatedBatch, batchCount + 1)
                 return updates
             }
+            .prepend(((nil,nil,nil), 0)) // Trigger the throttler.
             // Delay allowing the previous model update to settle before triggering a re-render.
             .throttle(for: .seconds(0.5), scheduler: RunLoop.main, latest: true)
             .sink { [weak self] (pendingUpdates: PageUpdateBatch, batchCount: Int) in
-                guard let self = self else { return }
                 let (pageUpdates, pageModel, moduleUpdates) = pendingUpdates
+                guard let self = self, batchCount > 0 else { return }
                 if let pageUpdates, pageModel != nil {
                     self.loadObject?.pageJSON = pageUpdates
                 }