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
```