[validator] fix - app crashing on edited message

lib/validator.js

@@ -4,8 +4,9 @@ const responder = require('./responseHandler.js');
 
 const validate =
 	(ctx, next) => {
-		if(!path(['update', 'message', 'from', 'id'], ctx)) return Promise.reject(ctx);
-		return ((ctx.update.message.from.id === config.masterID)
+		const fromId = path(['update', 'message', 'from', 'id'], ctx);
+		if(!fromId) return;
+		return ((fromId === config.masterID)
 			? Promise.resolve(ctx)
 			: Promise.reject(ctx))
 				.then(next)