Ticket #3076: fix regression in password recovery when email address given that doesn't match

Was triggering errors due to use of common_canonical_nickname() on arbitrary input without checking for exceptions about invalid nicknames (which didn't exist long ago in the before time)

actions/recoverpassword.php

@@ -282,7 +282,11 @@ class RecoverpasswordAction extends Action
         $user = User::staticGet('email', common_canonical_email($nore));
 
         if (!$user) {
+            try {
                 $user = User::staticGet('nickname', common_canonical_nickname($nore));
+            } catch (NicknameException $e) {
+                // invalid
+            }
         }
 
         # See if it's an unconfirmed email address