fix panic in handleInvalidCertificate (#675)

* fix panic in handleInvalidCertificate

when HandleMonitorTick fires, the hostmap can be nil which causes a panic to occur when trying to clean up the hostmap in handleInvalidCertificate. This fix just stops the invalidation from continuing if the hostmap doesn't exist.

* removed conditional for disconnectInvalid in HandleDeletionTick

connection_manager.go

@@ -230,12 +230,9 @@ func (n *connectionManager) HandleDeletionTick(now time.Time) {
 		hostinfo, err := n.hostMap.QueryVpnIp(vpnIp)
 		if err != nil {
 			n.l.Debugf("Not found in hostmap: %s", vpnIp)
-
-			if !n.intf.disconnectInvalid {
-				n.ClearIP(vpnIp)
-				n.ClearPendingDeletion(vpnIp)
-				continue
-			}
+			n.ClearIP(vpnIp)
+			n.ClearPendingDeletion(vpnIp)
+			continue
 		}
 
 		if n.handleInvalidCertificate(now, vpnIp, hostinfo) {