Fixed notice in AddCacheWarmerPass if there is no cache warmer defined.

Author: jakzal

src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/AddCacheWarmerPass.php

@@ -37,6 +37,10 @@ public function process(ContainerBuilder $container)
  $warmers[$priority][] = new Reference($id);
  }
 
+ if (empty($warmers)) {
+ return;
+ }
+
  // sort by priority and flatten
  krsort($warmers);
  $warmers = call_user_func_array('array_merge', $warmers);

src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/AddCacheWarmerPassTest.php

@@ -69,4 +69,24 @@ public function testThatCompilerPassIsIgnoredIfThereIsNoCacheWarmerDefinition()
  $addCacheWarmerPass = new AddCacheWarmerPass();
  $addCacheWarmerPass->process($container);
  }
+
+ public function testThatCacheWarmersMightBeNotDefined()
+ {
+ $definition = $this->getMock('Symfony\Component\DependencyInjection\Definition');
+ $container = $this->getMock('Symfony\Component\DependencyInjection\ContainerBuilder');
+
+ $container->expects($this->atLeastOnce())
+ ->method('findTaggedServiceIds')
+ ->will($this->returnValue(array()));
+ $container->expects($this->never())->method('getDefinition');
+ $container->expects($this->atLeastOnce())
+ ->method('hasDefinition')
+ ->with('cache_warmer')
+ ->will($this->returnValue(true));
+
+ $definition->expects($this->never())->method('replaceArgument');
+
+ $addCacheWarmerPass = new AddCacheWarmerPass();
+ $addCacheWarmerPass->process($container);
+ }
 }