Fix NullPointerException if no binding.

[ginyai]

Check if the binging is null before get soul network.
Check the result of syphonAndDamage before SigilBloodLight and SigilTransposition work.

[TehNut]

In what cases are these actually problems? By the time any of this is called, there should be a binding available.

[ginyai]

https://gist.github.com/ginyai/52d413be10a456d6e0207dbd5e9f235e
Sometimes this happens, but I cannot find out why.
On the other hand, others can cancel the ItemBindEvent to deny the binding.

[keraldi]

Did you ever bind a blood orb (created a soul network) when doing that?

[ginyai]

@Iorce I did. And I think it is irrelevant to the exception.