[Dialogue Display Framework] the dialogue section in the asset entry errors when dialogue isn't specified

[SinZ163]

Not my content pack, just passing it on.

https://smapi.io/log/88231f43b5ae4f2dbeb8f352d09195c5

https://smapi.io/json/none/2b4d0cec0e384f1e83bb62efaf886772 (has since changed to use aedenthorn.DialogueDisplayFramework, see #67)

Issue is in the use of GetDataVector without checking whether the data block is null or not, which it is correctly checked everywhere else in the patch
https://github.com/aedenthorn/StardewValleyMods/blob/235c4c7344b2b6270e6f5011c55d36e8a8be9f4e/DialogueDisplayFramework/CodePatches.cs#L363C14-L364