NPE in PasswordDialog

[joachimprinzbach]

Exception in thread "main" java.lang.NullPointerException: Cannot invoke "org.eclipse.swt.widgets.Display.syncExec(java.lang.Runnable)" because "this.display" is null
at com.baloise.proxy.ui.ProxyUISwt.showPasswordDialog(ProxyUISwt.java:164)
at common.Password.showDialog(Password.java:36)
at common.Password.get(Password.java:65)
at com.baloise.proxy.Proxy.start(Proxy.java:141)
at com.baloise.proxy.Proxy.main(Proxy.java:190)

Seems that display is not properly inizialized in every case.