🎨 Centralize error throwing for encryption keys and credentials (#3105)

* Centralized error throwing for encryption key

* Unifying the error message used by cli and core packages

* Improvements to error messages to make it more DRY

* Removed unnecessary throw

* Throwing error when credential does not exist to simplify node behavior (#3112)

Co-authored-by: Iván Ovejero <ivov.src@gmail.com>

packages/nodes-base/nodes/Chargebee/Chargebee.node.ts

@@ -489,10 +489,6 @@ export class Chargebee implements INodeType {
 
 		const credentials = await this.getCredentials('chargebeeApi');
 
-		if (credentials === undefined) {
-			throw new NodeOperationError(this.getNode(), 'No credentials got returned!');
-		}
-
 		const baseUrl = `https://${credentials.accountName}.chargebee.com/api/v2`;
 
 		// For Post