No longer bubble tag exceptions to the top

When a tag has an invalid component to it it would cause a whole file to fail
to parse. Instead we should consider invalid tags a nuisance but not worth
breaking the whole parsing over.

In this change I have added a try..catch that will prevent invalid tags from
breaking the whole parsing process.

src/DocBlock/StandardTagFactory.php

@@ -191,7 +191,11 @@ final class StandardTagFactory implements TagFactory
             $this->getServiceLocatorWithDynamicParameters($context, $name, $body)
         );
 
-        return call_user_func_array([$handlerClassName, 'create'], $arguments);
+        try {
+            return call_user_func_array([$handlerClassName, 'create'], $arguments);
+        } catch (\InvalidArgumentException $e) {
+            return null;
+        } 
     }
 
     /**