Merge pull request #2025 from metabase/fix-dependency-null-check

only attempt to update dependencies when we actually get back non-null dependencies.

src/metabase/events/dependencies.clj

@@ -37,7 +37,7 @@
             id      (events/object->model-id topic object)]
         ;; entity must support dependency tracking to continue
         (when (satisfies? IDependent entity)
-          (let [deps (dependency/dependencies entity id object)]
+          (when-let [deps (dependency/dependencies entity id object)]
             (dependency/update-dependencies entity id deps)))))
     (catch Throwable e
       (log/warn (format "Failed to process dependencies event. %s" (:topic dependency-event)) e))))