Buffer.from '' if this.app._event.body is falsy

fix: #123

Author: btakita

lib/request.js

@@ -159,8 +159,8 @@ class REQUEST {
     this.rawBody = this.app._event.body
 
     // Set the body (decode it if base64 encoded)
-    this.body = this.app._event.isBase64Encoded ? Buffer.from(this.app._event.body, 'base64').toString() : this.app._event.body
-
+    this.body = this.app._event.isBase64Encoded ? Buffer.from(this.app._event.body||'', 'base64').toString() : this.app._event.body
+    
     // Set the body
     if (this.headers['content-type'] && this.headers['content-type'].includes('application/x-www-form-urlencoded')) {
       this.body = QS.parse(this.body)