fix: can't create new graph

src/main/frontend/handler/repo.cljs

@@ -515,7 +515,7 @@
   "Checks to see if given db graph name already exists"
   [graph-name]
   (let [full-graph-name (string/lower-case (str config/db-version-prefix graph-name))]
-    (some #(= (string/lower-case (:url %)) full-graph-name) (state/get-repos))))
+    (some #(= (some-> (:url %) string/lower-case) full-graph-name) (state/get-repos))))
 
 (defn- create-db [full-graph-name {:keys [file-graph-import?]}]
   (->
@@ -544,4 +544,4 @@
        (state/pub-event! [:notification/show
                           {:content (str "The graph '" graph "' already exists. Please try again with another name.")
                            :status :error}])
-       (create-db full-graph-name opts)))))
+       (create-db full-graph-name opts)))))