Revert "fix: Call to a member function requestIsConditional() on null (dingo#1377)" (dingo#1490)

This reverts commit 815afb7.

Author: thilanga

src/Routing/Adapter/Lumen.php

@@ -107,7 +107,6 @@ public function dispatch(Request $request, $version)
         $this->removeMiddlewareFromApp();
 
         $routeCollector = $this->mergeOldRoutes($version);
-
         $dispatcher = call_user_func($this->dispatcherResolver, $routeCollector);
 
         $this->app->setDispatcher($dispatcher);

src/Routing/Router.php

@@ -402,10 +402,6 @@ protected function mergeGroup(array $new, array $old)
             $new[$option] = $this->formatArrayBasedOption($option, $new);
         }
 
-        if (isset($new['version'])) {
-            unset($old['version']);
-        }
-
         if (isset($new['domain'])) {
             unset($old['domain']);
         }
@@ -592,7 +588,7 @@ public function gatherRouteMiddlewares($route)
      */
     protected function requestIsConditional()
     {
-        return ($r = $this->getCurrentRoute()) ? $r->requestIsConditional() : false;
+        return $this->getCurrentRoute()->requestIsConditional();
     }
 
     /**