Fix datoms with false value not saving

To repro go to any non-journal page, view its page data and observe
that ':block/journal? false' was missing

src/main/frontend/modules/outliner/pipeline.cljs

@@ -111,7 +111,7 @@
 
              :else
              v)]
-    (when v'
+    (when (some? v')
       [a v'])))
 
 (defn invoke-hooks