Rémi Verschelde f38bfccf42 Object: Remove error on disconnect of locked signals ...

According to 22637beb2e (commitcomment-36651823)
and as confirmed by @reduz, this seems not to be necessary now that we
copy-on-write.

This triggered freeze scenarios in cases where a node would be deleted
while being used as a target in a signal emission.

Fixes #34650.
Fixes #34769.

Now those two errors go back to reporting:
```
ERROR: emit_signal: Condition ' !target ' is true. Continuing..:
   At: core/object.cpp:1191.
```

2020-01-13 17:03:02 +01:00

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