Fix error handling in updateMetadata

    async updateMetadata (elementId: UUID, metadata: TypedMetaData) {
      try {
        if (!this.metadata[elementId]) return
        const resp = await api.updateMetadata(metadata)
        const elementMetadata = this.metadata[elementId]
        const index = elementMetadata.findIndex(md => md.id === resp.id)
        if (index < 0) return
        elementMetadata.splice(index, 1, resp)
      } catch (err) {
        useNotificationStore().notify({ type: 'error', text: errorParser(err) })
        throw new Error(`Metadata ${metadata.id} not found on element ${elementId}`)
      }
    },

The error should be thrown @ if (index < 0)