some smaller improvements

lib/FredyRuntime.js

@@ -27,16 +27,25 @@ class FredyRuntime {
   execute() {
     if (!this._providerConfig.enabled) return Promise.resolve();
 
-    return Promise.resolve(this._providerConfig.url)
-      .then(this._getListings.bind(this))
-      .then(this._normalize.bind(this))
-      .then(this._filter.bind(this))
-      .then(this._findNew.bind(this))
-      .then(this._storeStats.bind(this))
-      .then(this._save.bind(this))
-      .then(this._notify.bind(this))
-      .then(this._updateStates.bind(this))
-      .catch(this._handleError.bind(this));
+    return (
+      Promise.resolve(this._providerConfig.url)
+        //scraping the site and try finding new listings
+        .then(this._getListings.bind(this))
+        //bring them in a proper form (dictated by the provider)
+        .then(this._normalize.bind(this))
+        //filter listings with stuff tagged by the blacklist of the provider
+        .then(this._filter.bind(this))
+        //check if new listings available. if so proceed
+        .then(this._findNew.bind(this))
+        //store update of number of found listings
+        .then(this._storeStats.bind(this))
+        //store everything in db
+        .then(this._save.bind(this))
+        //notify the user using the configured notification adapter
+        .then(this._notify.bind(this))
+        //if an error occurred on the way, handle it here.
+        .catch(this._handleError.bind(this))
+    );
   }
 
   _getListings(url) {
@@ -73,7 +82,6 @@ class FredyRuntime {
     const newListings = listings.filter(o => getKnownListings(this._jobKey, this._providerId).indexOf(o.id) === -1);
 
     if (newListings.length === 0) {
-      this._updateStates([]);
       throw new NoNewListingsError();
     }
 
@@ -85,10 +93,6 @@ class FredyRuntime {
     return Promise.all(sendNotifications).then(() => newListings);
   }
 
-  _updateStates(newListings) {
-    return newListings;
-  }
-
   _save(newListings) {
     setKnownListings(this._jobKey, this._providerId, [
       ...getKnownListings(this._jobKey, this._providerId),