[PM-4660] return early from cipher decryption if no encryption key (#6774)

* return early from cipher decryption if no key

* add comment

libs/common/src/vault/services/cipher.service.ts

@@ -293,6 +293,10 @@ export class CipherService implements CipherServiceAbstraction {
     const ciphers = await this.getAll();
     const orgKeys = await this.cryptoService.getOrgKeys();
     const userKey = await this.cryptoService.getUserKeyWithLegacySupport();
+    if (orgKeys == null && userKey == null) {
+      // return early if there are no keys to decrypt with
+      return;
+    }
 
     // Group ciphers by orgId or under 'null' for the user's ciphers
     const grouped = ciphers.reduce((agg, c) => {