[AP] Fix Follow collections

Activitypub_profile:
- Fix subscription-counter getter functions, invalid profiles were being counted

apActorFollowingAction:
- Small rewrite of generate_following, didn't make sense to not use try-catch block

apActorFollowersAction:
- Small rewrite of generate_followers, didn't make sense to not use try-catch block

plugins/ActivityPub/actions/apactorfollowers.php

@@ -116,18 +116,17 @@ class apActorFollowersAction extends ManagedAction
      */
     public static function generate_followers($profile, $since, $limit)
     {
-        /* Fetch Followers */
+        $subs = [];
         try {
             $sub = Activitypub_profile::getSubscribers($profile, $since, $limit);
-        } catch (NoResultException $e) {
-            // Just let the exception go on its merry way
-        }
 
             /* Get followers' URLs */
-        $subs = [];
             foreach ($sub as $s) {
                 $subs[] = ActivityPubPlugin::actor_uri($s);
             }
+        } catch (NoResultException $e) {
+            // Just let the exception go on its merry way
+        }
 
         return $subs;
     }

plugins/ActivityPub/actions/apactorfollowing.php

@@ -116,18 +116,17 @@ class apActorFollowingAction extends ManagedAction
      */
     public function generate_following($profile, $since, $limit)
     {
-        /* Fetch Following */
+        $subs = [];
         try {
             $sub = Activitypub_profile::getSubscribed($profile, $since, $limit);
-        } catch (NoResultException $e) {
-            // Just let the exception go on its merry way
-        }
 
             /* Get followed' URLs */
-        $subs = [];
             foreach ($sub as $s) {
                 $subs[] = ActivityPubPlugin::actor_uri($s);
             }
+        } catch (NoResultException $e) {
+            // Just let the exception go on its merry way
+        }
 
         return $subs;
     }

plugins/ActivityPub/classes/Activitypub_profile.php

@@ -505,9 +505,8 @@ class Activitypub_profile extends Managed_DataObject
 
         $sub = new Subscription();
         $sub->subscribed = $profile->id;
-        $sub->joinAdd(['subscriber', 'user:id'], 'LEFT');
-        $sub->joinAdd(['subscriber', 'activitypub_profile:profile_id'], 'LEFT');
         $sub->whereAdd('subscriber != subscribed');
+        $sub->whereAdd('subscriber IN (SELECT id FROM user UNION SELECT profile_id FROM activitypub_profile)');
         $cnt = $sub->count('distinct subscriber');
 
         self::cacheSet(sprintf('activitypub_profile:subscriberCount:%d', $profile->id), $cnt);
@@ -532,9 +531,8 @@ class Activitypub_profile extends Managed_DataObject
 
         $sub = new Subscription();
         $sub->subscriber = $profile->id;
-        $sub->joinAdd(['subscribed', 'user:id'], 'LEFT');
-        $sub->joinAdd(['subscribed', 'activitypub_profile:profile_id'], 'LEFT');
         $sub->whereAdd('subscriber != subscribed');
+        $sub->whereAdd('subscribed IN (SELECT id FROM user UNION SELECT profile_id FROM activitypub_profile)');
         $cnt = $sub->count('distinct subscribed');
 
         self::cacheSet(sprintf('activitypub_profile:subscriptionCount:%d', $profile->id), $cnt);