Fix empty addon watcher announcements (#778)

build.js

@@ -111,7 +111,8 @@ getCached().then(cached => {
         })
         if (cached.catalog.length && !cached.catalog.find(el => ((el || {}).manifest || {}).id === addonManifest.id)) {
           task.manifest = addonManifest
-          newAddons.push(task)
+          if (!config.blockedManifests.includes(task.url))
+            newAddons.push(task)
         }
         
         task.labels.pop('approved') // we shouldn't show the "approved" label on the addon page

config.js

@@ -37,7 +37,7 @@ module.exports = {
 	"needle": { "open_timeout": 5000, "response_timeout": 5000, "read_timeout": 5000, "follow_max": 5 },
 	// output folder for build
 	"build-dir": "./out",
-	"blockedAnnouncers": [
+	"blockedManifests": [
   	"https://comet.elfhosted.com/manifest.json",
 	]
 }