[IL85] Maybe show punctuations when app completions are null

When the app goes to the trouble of supplying completions,
but supplies null, then we should show punctuations if
settings allow.

Bug: 8636060
Change-Id: I33c32566039c80df61fcca3fab346fd336d96a12

java/src/com/android/inputmethod/latin/LatinIME.java

@@ -990,7 +990,7 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
         }
         if (!mSettings.getCurrent().isApplicationSpecifiedCompletionsOn()) return;
         if (applicationSpecifiedCompletions == null) {
-            clearSuggestionStrip();
+            setNeutralSuggestionStrip();
             if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
                 ResearchLogger.latinIME_onDisplayCompletions(null);
             }