Defensive coding for Text Node (#31)

* Defensive coding for Text Node

* Update src/ast.ts

Co-authored-by: Ryan Cebulko <[email protected]>

Co-authored-by: Ryan Cebulko <[email protected]>

Author: samouri

src/ast.ts

@@ -58,5 +58,5 @@ export function fromNode(node: Node): NodeProto {
 
 const termRegex = /[\w-]+/gm;
 export function getNumTerms(str: string): number {
-  return str.match(termRegex)?.length ?? 0;
+  return str?.match(termRegex)?.length ?? 0;
 }

src/dom.ts

@@ -58,7 +58,10 @@ function fromTreeProtoHelper(nodes: NodeProto[], doc: Document, parent: Node) {
   for (let i = 0; i < nodes.length; i++) {
     const node = nodes[i];
     if (!isElementNode(node)) {
-      parent.appendChild(doc.createTextNode(node.value));
+      // Only create the text node if it has contents.
+      if (node.value) {
+        parent.appendChild(doc.createTextNode(node.value));
+      }
       continue;
     }