fix(nuxt-error): prevent duplicate errors

also hides 404s from ssr

lib/app/components/nuxt-error.vue

@@ -33,27 +33,6 @@ export default {
       ]
     }
   },
-  <% if(debug) { %>
-  // Only on debug mode
-  data () {
-    return {
-      mounted: false
-    }
-  },
-  mounted () {
-    this.mounted = true
-  },
-  created () {
-    console.error(this.error)
-  },
-  watch: {
-    error(newErr) {
-      if(newErr) {
-        console.error(newErr)
-      }
-    }
-  },
-  <% } %>
   computed: {
     statusCode () {
       return (this.error && this.error.statusCode) || 500