normalizeInect should return for non-array

Author: jkzing

src/core/util/options.js

@@ -253,21 +253,17 @@ function normalizeProps (options: Object) {
  */
 function normalizeInject (options: Object) {
   const inject = options.inject
-  if (!inject) return
-  let res = {}
-  let i, val
-  if (Array.isArray(inject)) {
-    i = inject.length
-    while (i--) {
-      val = inject[i]
-      if (typeof val === 'string') {
-        res[val] = val
-      } else if (process.env.NODE_ENV !== 'production') {
-        warn('inject must be strings when using array syntax.')
-      }
+  if (!Array.isArray(inject)) return
+  const res = {}
+  let i = inject.length
+  let val
+  while (i--) {
+    val = inject[i]
+    if (typeof val === 'string') {
+      res[val] = val
+    } else if (process.env.NODE_ENV !== 'production') {
+      warn('inject must be strings when using array syntax.')
     }
-  } else if (isPlainObject(inject)) {
-    res = options.inject
   }
   options.inject = res
 }