launcher3: Handle case where install session could be invalid.

If the install session comes back as invalid, we can fail to add
a promise icon which leads to icons not showing up on the workspace.

Bug: 419426642
Test: None yet
Flag: EXEMPT Bug fix
Change-Id: I592948eb2b60c2249bb5b141d499d1d5ea01aebc

src/com/android/launcher3/pm/InstallSessionHelper.java

@@ -195,7 +195,8 @@ public class InstallSessionHelper {
 
     @WorkerThread
     public boolean promiseIconAddedForId(final int sessionId) {
-        return getPromiseIconIds().contains(sessionId);
+        // Make sure the session id is valid.
+        return sessionId != -1 && getPromiseIconIds().contains(sessionId);
     }
 
     @WorkerThread