Make callback optional.

lib/notifo.js

@@ -21,7 +21,7 @@ function Notifo(args) {
 Notifo.prototype.send = function (options, callback) {
 	// Setup default values and light validation.
 	if (!options.title && !options.uri && !options.msg) {
-		callback(new Error('Tried to send notification without any information.'), null);
+		callback && callback(new Error('Tried to send notification without any information.'), null);
 		return false;
 	}
 
@@ -31,7 +31,7 @@ Notifo.prototype.send = function (options, callback) {
 	});
 
 	if (!options.msg) {
-		callback(new Error('Must supply a msg.'), null);
+		callback && callback(new Error('Must supply a msg.'), null);
 		return false;
 	}
 
@@ -51,19 +51,19 @@ Notifo.prototype.send = function (options, callback) {
 			try {
 				var response = JSON.parse(body.match(/{"status.*/)[0].trim());
 				if (response['response_code'] !== 2201) {
-					callback(new Error('notifo code '+response['response_code']+': '+response['response_message']), response);
+					callback && callback(new Error('notifo code '+response['response_code']+': '+response['response_message']), response);
 				} else {
-					callback(null, response);
+					callback && callback(null, response);
 				}
 			} catch(e) {
-				callback(e, null);
+				callback && callback(e, null);
 			}
 		});
 	});
 	req.write(qs.stringify(options));
 	req.end();
 
 	req.on('error', function(e) {
-		callback(e, null);
+		callback && callback(e, null);
 	});
-};
+};