解决二三维切换时出现的一些报错

src/Obj/Base/GroundSvg/index.js

@@ -1212,7 +1212,7 @@ class GroundSvg extends Base {
   * @param {boolean} status=false 状态
   */
   drag(status, cd) {
-    if (!this.#loaded) {
+    if (!this.#loaded || !this.sdk || !this.sdk.viewer) {
       return
     }
     this.ismove = false
@@ -2020,6 +2020,9 @@ class GroundSvg extends Base {
       return
     }
     this.drag(false)
+    if(!this.sdk || !this.sdk.viewer) {
+      return
+    }
     this.sdk.viewer.entities.remove(this.entity)
     this.text && this.text.remove()
     for (let i = this.entity.values.length; i >= 0; i--) {