Do not send an unbind request if the authentication fails

Looks like Studio is sending an unbind request even when authentication fails.

Server throws the following error when tried to authenticate anonymously(server is configured to disallow anonymous access)

[11:35:57] ERROR [org.apache.directory.server.ldap.handlers.request.UnbindRequestHandler] - ERR_169 failed to unbind session properly
org.apache.directory.api.ldap.model.exception.LdapNoSuchObjectException: ERR_268 Cannot find a partition for
at org.apache.directory.server.core.shared.partition.DefaultPartitionNexus.getPartition(DefaultPartitionNexus.java:923)
at org.apache.directory.server.core.shared.partition.DefaultPartitionNexus.unbind(DefaultPartitionNexus.java:790)
at org.apache.directory.server.core.api.interceptor.BaseInterceptor$1.unbind(BaseInterceptor.java:266)
at org.apache.directory.server.core.api.interceptor.BaseInterceptor.next(BaseInterceptor.java:690)
at org.apache.directory.server.core.authn.AuthenticationInterceptor.unbind(AuthenticationInterceptor.java:1170)
at org.apache.directory.server.core.DefaultOperationManager.unbind(DefaultOperationManager.java:1230)
at org.apache.directory.server.core.shared.DefaultCoreSession.unbind(DefaultCoreSession.java:1073)
at org.apache.directory.server.ldap.handlers.request.UnbindRequestHandler.handle(UnbindRequestHandler.java:50)
at org.apache.directory.server.ldap.handlers.request.UnbindRequestHandler.handle(UnbindRequestHandler.java:38)
at org.apache.directory.server.ldap.handlers.LdapRequestHandler.handleMessage(LdapRequestHandler.java:219)
at org.apache.directory.server.ldap.handlers.LdapRequestHandler.handleMessage(LdapRequestHandler.java:56)
at org.apache.mina.handler.demux.DemuxingIoHandler.messageReceived(DemuxingIoHandler.java:221)
at org.apache.directory.server.ldap.LdapProtocolHandler.messageReceived(LdapProtocolHandler.java:217)
at org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.messageReceived(DefaultIoFilterChain.java:690)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:417)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:47)
at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:765)
at org.apache.mina.core.filterchain.IoFilterEvent.fire(IoFilterEvent.java:74)
at org.apache.mina.core.session.IoEvent.run(IoEvent.java:63)
at org.apache.mina.filter.executor.UnorderedThreadPoolExecutor$Worker.runTask(UnorderedThreadPoolExecutor.java:474)
at org.apache.mina.filter.executor.UnorderedThreadPoolExecutor$Worker.run(UnorderedThreadPoolExecutor.java:428)
at java.lang.Thread.run(Thread.java:662)