Do not fail when closing the FTP connection

Author: dadoonet

crawler/crawler-ftp/src/main/java/fr/pilato/elasticsearch/crawler/fs/crawler/ftp/FileAbstractorFTP.java

@@ -180,9 +180,13 @@ public void open() throws IOException {
 
     @Override
     public void close() throws IOException {
-        if (ftp.isConnected()) {
-            ftp.logout();
-            ftp.disconnect();
+        try {
+            if (ftp.isConnected()) {
+                ftp.logout();
+                ftp.disconnect();
+            }
+        } catch (IOException e) {
+            logger.warn("Error during FTP logout: {}", e.getMessage());
         }
     }