refactor(cli): basic error messages improvments

Co-authored-by: danielpeintner <daniel.peintner@gmail.com>

Author: relu91

packages/binding-mqtt/src/mqtt-broker-server.ts

@@ -446,7 +446,7 @@ export default class MqttBrokerServer implements ProtocolServer {
     private async startBroker() {
         return new Promise<void>((resolve, reject) => {
             if (this.brokerURI == null) {
-                throw new Error("Unexpected configuration state broker was started even if brokerURI is null");
+                throw new Error("Unexpected configuration state. Broker was started but brokerURI is null");
             }
 
             this.hostedServer = Server({});

packages/cli/src/parsers/config-file-parser.ts

@@ -26,6 +26,6 @@ export function parseConfigFile(filename: string, previous: unknown) {
         if (err instanceof InvalidArgumentError) {
             throw err;
         }
-        throw new InvalidArgumentError(`\nError reading config file: ${err}`);
+        throw new InvalidArgumentError(`Error reading config file: ${err}`);
     }
 }