Crash in Keychain.framework

> **@dkocher** created the issue

```
Thread 21 Crashed:
0   libSystem.B.dylib        	0x90003008 strlen + 8
1   Keychain.framework       	0x016002e4 -[Keychain addInternetPassword:onServer:forAccount:port:path:inSecurityDomain:protocol:auth:replaceExisting:] + 248
2   libKeychain.dylib        	0x015ba8e8 Java_ch_cyberduck_core_Keychain_addInternetPasswordToKeychain + 216 (Keychain.m:67)

```
