Puppeteer's Page.navigate should not throw with invalid URL.

This patch makes puppeteer's Page.navigate to just return
'false' when given an invalid URL.

lib/Page.js

@@ -260,7 +260,11 @@ class Page extends EventEmitter {
         var interstitialPromise = new Promise(fulfill => this._client.once('Security.certificateError', fulfill)).then(() => false);
         var referrer = this._extraHeaders.referer;
         // Await for the command to throw exception in case of illegal arguments.
-        await this._client.send('Page.navigate', {url, referrer});
+        try {
+            await this._client.send('Page.navigate', {url, referrer});
+        } catch (e) {
+            return false;
+        }
         return await Promise.race([loadPromise, interstitialPromise]);
     }
 

test/test.js

@@ -40,6 +40,17 @@ describe('Puppeteer', function() {
         expect(msgs).toEqual(['Message!']);
     }));
 
+    describe('Page.navigate', function() {
+        it('should fail when navigating to bad url', SX(async function() {
+            var success = await page.navigate('asdfasdf');
+            expect(success).toBe(false);
+        }));
+        it('should succeed when navigating to good url', SX(async function() {
+            var success = await page.navigate(EMPTY_PAGE);
+            expect(success).toBe(true);
+        }));
+    });
+
     describe('Page.setInPageCallback', function() {
         it('should work', SX(async function() {
             await page.setInPageCallback('callController', function(a, b) {