Fix: When destroying a component with an not initialized swiper.

[HappyGray24]

When you destroy a component, where swiper not initialized (swiper.initialized === undefined || swiper.initialized === false), then an error occurs: "Failed to execute 'remove' on 'DOMTokenList'."

Fix the code on the per-line 115 file ~/src/ssr.js on:

if (swiper) {
  if (swiper.destroy && swiper.initialized === true) {
    swiper.destroy();
  }
  delete vnode.context[instanceName]
}

that not to destroy the not yet initialized swiper../

#340

[hoektoe]

Is the maintainer gone , haven't seen any progress on this repo

[qntndev]

@surmon-china Please merge 🙏

[surmon-china]

Thanks!

[surmon-china]

The change will merge to v4.0.0