fix: pages don't have #Page tag when importing from markdown files

related to logseq/db-test#641

Author: tiensonqin

deps/graph-parser/src/logseq/graph_parser/exporter.cljs

@@ -227,7 +227,8 @@
                                 (disj :logseq.class/Page))))
         (seq page-tags)
         (merge {:logseq.property/page-tags page-tags})))
-    block))
+    ;; ensure page at least have a Page tag
+    (assoc block :block/tags [:logseq.class/Page])))
 
 (defn- add-uuid-to-page-map [m page-names-to-uuids]
   (assoc m :block/uuid (get-page-uuid page-names-to-uuids (:block/name m) {:block m})))