Fix ssb-mentions adding null mentions

See: https://github.com/ssbc/ssb-mentions/issues/14

src/pages/publish-reply-all.js

@@ -6,7 +6,9 @@ const meta = require('./models/post')
 
 module.exports = async function publishReplyAllPage ({ message, text }) {
   // TODO: rename `message` to `parent` or `ancestor` or similar
-  const mentions = ssbMentions(text) || undefined
+  const mentions = ssbMentions(text).filter((mention) =>
+    mention != null
+  ) || undefined
   const parent = await meta.get(message)
 
   return post.replyAll({

src/pages/publish-reply.js

@@ -5,7 +5,9 @@ const post = require('./models/post')
 
 module.exports = async function publishReplyPage ({ message, text }) {
   // TODO: rename `message` to `parent` or `ancestor` or similar
-  const mentions = ssbMentions(text) || undefined
+  const mentions = ssbMentions(text).filter((mention) =>
+    mention != null
+  ) || undefined
 
   const parent = await post.get(message)
   return post.reply({

src/pages/publish.js

@@ -4,7 +4,9 @@ const ssbMentions = require('ssb-mentions')
 const post = require('./models/post')
 
 module.exports = async function publishPage ({ text }) {
-  const mentions = ssbMentions(text) || undefined
+  const mentions = ssbMentions(text).filter((mention) =>
+    mention != null
+  ) || undefined
   return post.publish({
     text,
     mentions