fix: pullMessages error handling

.gitignore

@@ -7,3 +7,4 @@ test.js
 cam_tests
 experiments
 docs
+.nyc_output/

lib/events.js

@@ -230,6 +230,8 @@ module.exports = function(Cam) {
 		} catch (e) {
 			if (callback && callback.call) {
 				callback.call(this, new Error('You should create pull-point subscription first!'));
+			} else {
+				throw new Error('You should create pull-point subscription first!');
 			}
 			return;
 		}

test/events.js

@@ -35,9 +35,12 @@ describe('Events', () => {
 	});
 	it('should throws an error in PullMessages method when no pull-point subscription exists', (done) => {
 		assert.throws(() => {
-			cam.pullMessages({}, () => {});
+			cam.pullMessages({});
+		});
+		cam.pullMessages({}, (err) => {
+			assert.notEqual(err, null);
+			done();
 		});
-		done();
 	});
 	it('should create PullPointSubscription', (done) => {
 		cam.createPullPointSubscription((err, data) => {