Address broken tests

Author: jhutchings1

dist/index.js

@@ -87,7 +87,7 @@ function searchFiles() {
 // Fixes issues with an escaped version string
 function replaceVersionEscape(purl) {
   //If there's an "@" in the purl, then we don't need to do anything.
-  if (!purl?.includes("@")) {
+  if (purl != null && purl != undefined && !purl?.includes("@")) {
     let index = purl.lastIndexOf("%40");
     if (index > 0) {
       purl = purl.substring(0, index) + "@" + purl.substring(index + 3);