fix: layer.getContainer could return null

Author: iisakkirotko

src/index.js

@@ -93,22 +93,23 @@ L.Control.SplitMap = L.Control.extend({
     if (!this._map) {
       return this
     }
+    const removeLayerClip = (layer) => {
+      if (layer.getContainer) {
+          const container = layer.getContainer()
+          if (container) {
+              container.style.clip = ""
+          }
+      }
+      else {
+          layer.getPane().style.clip = ""
+      }
+    }
     this._leftLayers.forEach((left_layer)=> {
-        if (left_layer.getContainer) {
-            left_layer.getContainer().style.clip = ""
-        }
-        else {
-            left_layer.getPane().style.clip = ""
-        }
+        removeLayerClip(left_layer)
     })
 
     this._rightLayers.forEach((right_layer)=>{
-        if (right_layer.getContainer) {
-            right_layer.getContainer().style.clip = ""
-        }
-        else {
-            right_layer.getPane().style.clip = ""
-        }
+        removeLayerClip(right_layer)
     })
     this._removeEvents()
     L.DomUtil.remove(this._container)