more channel management cleanup

app/controllers/admin/venue.js

@@ -62,8 +62,12 @@ class VenueAdminController extends SiteController {
   }
 
   async postUpdateChannel (req, res, next) {
-    const { venue: venueService } = this.dtp.services;
+    const { user: userService, venue: venueService } = this.dtp.services;
     try {
+      const owner = await userService.lookup(req.body.owner);
+      if (!owner) {
+        throw new SiteError(400, `Channel owner is empty or invalid: ${req.body.owner}`);
+      }
       await venueService.updateChannel(res.locals.channel, req.body);
       res.redirect('/admin/venue/channel');
     } catch (error) {
@@ -77,7 +81,7 @@ class VenueAdminController extends SiteController {
     try {
       const owner = await userService.lookup(req.body.owner);
       if (!owner) {
-        throw new SiteError(400, 'Channel owner is empty or invalid');
+        throw new SiteError(400, `Channel owner is empty or invalid: ${req.body.owner}`);
       }
       await venueService.createChannel(owner, req.body);
       res.redirect('/admin/venue/channel');

app/views/admin/venue/channel/editor.pug

@@ -61,7 +61,7 @@ block content
           div(class="uk-width-1-1 uk-width-1-2@s")
             label(for="owner").uk-form-label Owner
             .uk-form-controls
-              input(type="text", name="owner", placeholder=`Enter channel owner's local username (here on ${site.name})`, value= channel ? channel.owner.username : user.username).uk-input
+              input(id="owner", type="text", name="owner", placeholder=`Enter channel owner's local username (here on ${site.name})`, value= channel ? channel.owner.username : user.username).uk-input
 
           div(class="uk-width-1-1 uk-width-1-2@s")
             label(for="sort-order").uk-form-label Sort order