fix :js-options :resolve package to false

prevents a npm require from being included in the package and was
previously broken due to a bad `or` use

src/main/shadow/build/npm.clj

@@ -313,7 +313,7 @@
    "zlib" "browserify-zlib"})
 
 (def empty-rc
-  (let [ns 'shadow.empty]
+  (let [ns 'shadow$empty]
     {:resource-id [::empty "shadow$empty.js"]
      :resource-name "shadow$empty.js"
      :output-name "shadow$empty.js"

src/main/shadow/build/resolve.clj

@@ -91,8 +91,12 @@
   ;; "./something.js" would override anything from any package
   ;; just assume ppl will only override packages for now
   (let [resolve-cfg
-        (or (get-in require-ctx [:resolve require])
-            (get global-resolve-config require))]
+        (let [x (get-in require-ctx [:resolve require])]
+          ;; can't use `or` since `false` is a legal return
+          (if-not (nil? x)
+            x
+            (get global-resolve-config require)
+            ))]
 
     (if (false? resolve-cfg)
       npm/empty-rc