Prevent error from cache update on deleted files

lib/private/files/storage/local.php

@@ -305,7 +305,11 @@ if (\OC_Util::runningOnWindows()) {
 		 * @return bool
 		 */
 		public function hasUpdated($path, $time) {
-			return $this->filemtime($path) > $time;
+			if ($this->file_exists($path)) {
+				return $this->filemtime($path) > $time;
+			} else {
+				return true;
+			}
 		}
 
 		/**