fixed bug in yas-next-field using Gemini 2.5 Pro

[NightMachinery]

The chat history for fixing this bug:

• https://aistudio.google.com/app/prompts?state=%7B%22ids%22:%5B%221yzjWFcnr0_TCn8GVo8PaMnDsZXDPEY1A%22%5D,%22action%22:%22open%22,%22userId%22:%22110597464211828359400%22,%22resourceKeys%22:%7B%7D%7D&usp=sharing

Fixes this error:

Debugger entered--Lisp error: (wrong-type-argument yas--snippet nil)
  yas--find-next-field(1 nil #s(yas--field :number 1 :start 10 :end 17 :parent-field nil :mirrors nil :transform nil :modified-p nil :next #s(yas--exit :marker 19 :next nil)))
  yas-next-field()
  yas-next-field-or-maybe-expand()
  funcall-interactively(yas-next-field-or-maybe-expand)
  command-execute(yas-next-field-or-maybe-expand)