Update src/core/utils/openidHelper.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: LongOddCode

src/core/utils/openidHelper.ts

@@ -5,6 +5,12 @@ export class OpenIdHelper {
   private clientId: string;
 
   constructor(issuerUrl: string, clientId: string) {
+    if (issuerUrl == null || issuerUrl === "") {
+      throw new Error("issuerUrl must be a non-null, non-empty string");
+    }
+    if (clientId == null || clientId === "") {
+      throw new Error("clientId must be a non-null, non-empty string");
+    }
     this.issuerUrl = new URL(issuerUrl);
     this.clientId = clientId;
   }