fix linting errors and clean up ze code

Signed-off-by: VoR0220 <catalanor0220@gmail.com>

lib/core/engine.js

@@ -189,7 +189,7 @@ class Engine {
     });
     this.registerModule('profiler', {
       events: this.events,
-      logger: this.logger,
+      logger: this.logger
     });
 
     this.contractsManager = new ContractsManager({

lib/modules/profiler/index.js

@@ -27,15 +27,15 @@ class Profiler {
   }
 
   formatParams(params) {
-    if (undefined !== params && params.length) {
+    if (!params || !params.length) {
+      return "()";
+    }
     let paramString = "(";
     let mappedParams = params.map(param => param.type);
-      paramString += mappedParams.join(',')
+    paramString += mappedParams.join(',');
     paramString += ")";
     return paramString;
   }
-    return "()";
-  }
 
   registerConsoleCommand() {
     const self = this;