fix: guard createInstanceFromRow against null/undefined input

The all-collections-methods-coverage smoke test invokes every public
method including createInstanceFromRow (starts with 'create', treated as
mutating). With no args the call reached fromDbRecord(undefined) and
threw a TypeError that didn't match the expected-error patterns, failing
all 36 collection smoke tests.

Add an isNonEmptyObject guard so the method returns null gracefully
instead of throwing — consistent with #createInstance's own null-return
contract for empty records.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: ekremney

packages/spacecat-shared-data-access/src/models/base/base.collection.js

@@ -595,6 +595,7 @@ class BaseCollection {
    * @returns {object|null} A model instance, or null if the row is empty/invalid.
    */
   createInstanceFromRow(row) {
+    if (!isNonEmptyObject(row)) return null;
     return this.#createInstance(this.#toModelRecord(row));
   }