Problem: segfault in eventcatcher

```

panic: runtime error: invalid memory address or nil pointer dereference

[signal SIGSEGV: segmentation violation code=0x2 addr=0x0 pc=0x1044c9564]

goroutine 20 [running]:

nostrocket/messaging/eventcatcher.SubscribeToTree(0x1400008c120, 0x1400006a300, 0x1400008c0c0)

/Users/g/nostrocket_repo/engine/messaging/eventcatcher/eventcatcher.go:63 +0x354

created by nostrocket/messaging/eventconductor.handleEvents

/Users/g/nostrocket_repo/engine/messaging/eventconductor/eventconductor.go:64 +0x170

exit status 2

make: *** [reset] Error 1

```