Prevents crash when connecting to FTP

Catch FTP connection errors so it won't break the server.

lib/unifile-ftp.js

@@ -159,6 +159,9 @@ class FtpConnector {
 
 		return new Promise((resolve, reject) => {
 			const client = new Ftp(ftpConf);
+			client.on('error', (err) => {
+				reject(err);
+			});
 			// Successful connection
 			client.once('connect', () => {
 				client.auth(ftpConf.user, ftpConf.password, (err) => {
@@ -168,7 +171,10 @@ class FtpConnector {
 			});
 		})
 		.catch((err) => {
-			throw new UnifileError(UnifileError.EACCES, 'Invalid credentials');
+			if(err.code === 'ETIMEDOUT')
+				throw new UnifileError(UnifileError.EIO, 'Unable to reach server');
+			else
+				throw new UnifileError(UnifileError.EACCES, 'Invalid credentials');
 		})
 		.then(() => {
 			Object.assign(session, ftpConf);