Fix an infinite loop

What do you mean "Can't happen"?
It happens all the time - the empty string is the default ID, and it
needs to be updated like everyone else.

Bug: 8651858
Change-Id: I5a2f2ebb5b2ef08b27f26be8fb2c3d2f231ebcfc

java/src/com/android/inputmethod/dictionarypack/UpdateHandler.java

@@ -181,7 +181,6 @@ public final class UpdateHandler {
             if (!cursor.moveToFirst()) return;
             do {
                 final String clientId = cursor.getString(0);
-                if (TextUtils.isEmpty(clientId)) continue; // This probably can't happen
                 final String metadataUri =
                         MetadataDbHelper.getMetadataUriAsString(context, clientId);
                 PrivateLog.log("Update for clientId " + Utils.s(clientId), context);