fix: filter out contacts with empty email addresses in sharee completion

Signed-off-by: Julius Knorr <jus@bitgrid.net>

Author: juliusknorr

lib/private/Collaboration/Collaborators/MailPlugin.php

@@ -93,6 +93,9 @@ public function search($search, $limit, $offset, ISearchResult $searchResult): b
 					$emailAddresses = [$emailAddresses];
 				}
 				foreach ($emailAddresses as $type => $emailAddress) {
+					if (empty($emailAddress)) {
+						continue;
+					}
 					$displayName = $emailAddress;
 					$emailAddressType = null;
 					if (\is_array($emailAddress)) {