DataInputQueue nullptr check

[themarpe]

This checks if a nullptr was passed to send method of DataInputQueue and which also applies to None being passed from Python bindings

[SzabolcsGergely]

LGTM.
Is there a context where this issue came up (out of curiosity) or just general fix?

[Luxonis-Brandon]

I was just about to ask the same question actually. Mainly because I'm overly-optimistically-hoping that this is the fix to Raspberry Pi issue. But I'm guessing this is likely not the resolution to that but rather something discovered in that hunt.

[themarpe]

Unfortunately doesn't addresses any burning issue - was a tad stale from a couple of days ago as I was working on a custom script and sent None type instead of actual message (returned by a "void" function in Python). Programming mistake on my end but looked quite serious at first glance. (As the program segfaulted)

[Luxonis-Brandon]

Thanks. Makes sense.