Fix exception awarding empty badge to user

Summary:
When awarding a badge to a user without having actually selected a batch to award, do not fail on running a database query with no parameter. Instead, silently fail without an error and reload the page, similar to the behavior of `Add Recipients` on `/badges/recipients/1/` in this case.
Do not throw an Aphront404Response as it would make the `Award Badge` button in the dialog inaccessible and keep the dysfunctional overlay dialog displayed.

```
EXCEPTION: (AphrontParameterQueryException) Array for %Ls conversion is empty. Query: badges.phid IN (%Ls) at [<phorge>/src/infrastructure/storage/xsprintf/qsprintf.php:383]
```

Closes T15825

Test Plan: Go to a user's badges, click the `Award Badge` button, in the dialog do not select any Badge and click the `Award` button.

Reviewers: O1 Blessed Committers, valerio.bozzolan

Reviewed By: O1 Blessed Committers, valerio.bozzolan

Subscribers: avivey, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Maniphest Tasks: T15825

Differential Revision: https://we.phorge.it/D25636

src/applications/badges/controller/PhabricatorBadgesAwardController.php

@@ -6,6 +6,8 @@ final class PhabricatorBadgesAwardController
   public function handleRequest(AphrontRequest $request) {
     $viewer = $request->getViewer();
     $id = $request->getURIData('id');
+    $errors = array();
+    $e_badge = true;
 
     $user = id(new PhabricatorPeopleQuery())
       ->setViewer($viewer)
@@ -19,6 +21,12 @@ final class PhabricatorBadgesAwardController
 
     if ($request->isFormPost()) {
       $badge_phids = $request->getArr('badgePHIDs');
+
+      if (empty($badge_phids)) {
+        $errors[] = pht('Badge name is required.');
+        $e_badge = pht('Required');
+      }
+      if (!$errors) {
         $badges = id(new PhabricatorBadgesQuery())
           ->setViewer($viewer)
           ->withPHIDs($badge_phids)
@@ -28,9 +36,6 @@ final class PhabricatorBadgesAwardController
               PhabricatorPolicyCapability::CAN_VIEW,
             ))
           ->execute();
-      if (!$badges) {
-        return new Aphront404Response();
-      }
         $award_phids = array($user->getPHID());
 
         foreach ($badges as $badge) {
@@ -51,6 +56,7 @@ final class PhabricatorBadgesAwardController
         return id(new AphrontRedirectResponse())
           ->setURI($view_uri);
       }
+    }
 
     $form = id(new AphrontFormView())
       ->setUser($viewer)
@@ -58,6 +64,7 @@ final class PhabricatorBadgesAwardController
         id(new AphrontFormTokenizerControl())
           ->setLabel(pht('Badge'))
           ->setName('badgePHIDs')
+          ->setError($e_badge)
           ->setDatasource(
             id(new PhabricatorBadgesDatasource())
               ->setParameters(