fix empty type name

src/utils/Doc.js

@@ -126,45 +126,45 @@ export class Doc extends Observable {
 
   /**
    * @template T
-   * @param {string} name
+   * @param {string} [name]
    * @return {YArray<T>}
    *
    * @public
    */
-  getArray (name) {
+  getArray (name = '') {
     // @ts-ignore
     return this.get(name, YArray)
   }
 
   /**
-   * @param {string} name
+   * @param {string} [name]
    * @return {YText}
    *
    * @public
    */
-  getText (name) {
+  getText (name = '') {
     // @ts-ignore
     return this.get(name, YText)
   }
 
   /**
-   * @param {string} name
+   * @param {string} [name]
    * @return {YMap<any>}
    *
    * @public
    */
-  getMap (name) {
+  getMap (name = '') {
     // @ts-ignore
     return this.get(name, YMap)
   }
 
   /**
-   * @param {string} name
+   * @param {string} [name]
    * @return {YXmlFragment}
    *
    * @public
    */
-  getXmlFragment (name) {
+  getXmlFragment (name = '') {
     // @ts-ignore
     return this.get(name, YXmlFragment)
   }

src/utils/encoding.js

@@ -152,7 +152,7 @@ export const readClientsStructRefs = (decoder, clientRefs, doc) => {
 
         const struct = new Item(
           createID(client, clock), null, origin, null, rightOrigin,
-          canCopyParentInfo && !hasParentYKey ? decoder.readLeftID() : (parentYKey ? doc.get(parentYKey) : null), // parent
+          canCopyParentInfo && !hasParentYKey ? decoder.readLeftID() : (parentYKey !== null ? doc.get(parentYKey) : null), // parent
           canCopyParentInfo && (info & binary.BIT6) === binary.BIT6 ? decoder.readString() : null, // parentSub
           /** @type {AbstractContent} */ (readItemContent(decoder, info)) // item content
         )