Hot fix browser management wait for new window and timeout issue (#66)

Author: atthaboon

PuppeteerLibrary/keywords/utility.py

@@ -20,8 +20,7 @@ def set_timeout(self, timeout):
         See the Timeout section above for more information.
 
         Example:
-
-        | ${orig timeout} =	          | Set Timeout	     | 15 seconds |
+        
         | Open page that loads slowly |	                 |            |
         | Set Timeout	              | ${orig timeout}	 |            |
 

PuppeteerLibrary/puppeteer/async_keywords/puppeteer_browsermanagement.py

@@ -56,7 +56,7 @@ async def _get_window_count_async(self):
             try:
                 await page.title()
             except:
-                return []
+                return -1
         return len(await self.library_ctx.get_all_pages())
 
     async def switch_window(self, locator='MAIN'):