Revert "Re-enable throw when notifications posted can't find channel"

This reverts commit ed0a854b0c2bc1a8e9b9c7f28cd87982ef9d129a.
Bug: 36785228
Change-Id: I26a50c2050c50d8223ed5c20793db565ba9356d7

(cherry picked from commit c83713db6a09698a48b4648f2a8a7a8c9c60773e)
diff --git a/services/core/java/com/android/server/notification/NotificationManagerService.java b/services/core/java/com/android/server/notification/NotificationManagerService.java
index 7468b95..ede5a5e 100644
--- a/services/core/java/com/android/server/notification/NotificationManagerService.java
+++ b/services/core/java/com/android/server/notification/NotificationManagerService.java
@@ -90,7 +90,6 @@
 import android.media.IRingtonePlayer;
 import android.net.Uri;
 import android.os.Binder;
-import android.os.Build;
 import android.os.Bundle;
 import android.os.Environment;
 import android.os.Handler;
@@ -3127,9 +3126,8 @@
                     + ", incomingUserId=" + incomingUserId
                     + ", notificationUid=" + notificationUid
                     + ", notification=" + notification;
-            if (Build.IS_DEBUGGABLE) {
-                throw new IllegalArgumentException(noChannelStr);
-            }
+            // STOPSHIP TODO: should throw instead of logging.
+            // throw new IllegalArgumentException(noChannelStr);
             Log.e(TAG, noChannelStr);
             return;
         }