Fix kvstore unable to push resize_cursor for resize when dict is NULL (#13031)

When the dict is NULL, we also need to push resize_cursor, otherwise it
will keep doing useless continue here, and there is no way to resize the
other dict behind it.

Introduced in #12822.

---------

Co-authored-by: Oran Agra <oran@redislabs.com>

src/kvstore.c

@@ -578,9 +578,7 @@ void kvstoreTryResizeDicts(kvstore *kvs, int limit) {
     for (int i = 0; i < limit; i++) {
         int didx = kvs->resize_cursor;
         dict *d = kvstoreGetDict(kvs, didx);
-        if (!d)
-            continue;
-        if (dictShrinkIfNeeded(d) == DICT_ERR) {
+        if (d && dictShrinkIfNeeded(d) == DICT_ERR) {
             dictExpandIfNeeded(d);
         }
         kvs->resize_cursor = (didx + 1) % kvs->num_dicts;