Fix sharing and around three errors related to Undefined array key "C…

…LOUD"

We try to access $contact['CLOUD'] when it might not be set. As a consequence of that 3 PHP errors are generated the last one being an uncaught exception that makes it impossible to share files locally.

This patch adds a simple check to ensure the value exists before using it.

Signed-off-by: Francisco Blas Izquierdo Riera (klondike) <klondi@users.noreply.github.com>

lib/private/Collaboration/Collaborators/MailPlugin.php

@@ -186,7 +186,7 @@ public function search($search, $limit, $offset, ISearchResult $searchResult) {
 							return false;
 						}
 
-						if ($this->shareeEnumeration) {
+						if ($this->shareeEnumeration && isset($contact['CLOUD'])) {
 							try {
 								$cloud = $this->cloudIdManager->resolveCloudId($contact['CLOUD'][0]);
 							} catch (\InvalidArgumentException $e) {