Fix inconsistent return points.

Author: derrabus

Command/ServerStartCommand.php

@@ -155,5 +155,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
 
             return 1;
         }
+
+        return null;
     }
 }

Command/ServerStatusCommand.php

@@ -88,5 +88,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
                 return 1;
             }
         }
+
+        return null;
     }
 }

Command/ServerStopCommand.php

@@ -62,5 +62,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
 
             return 1;
         }
+
+        return null;
     }
 }

WebServerConfig.php

@@ -101,6 +101,12 @@ public function getAddress()
         return $this->hostname.':'.$this->port;
     }
 
+    /**
+     * @param string $documentRoot
+     * @param string $env
+     *
+     * @return string|null
+     */
     private function findFrontController($documentRoot, $env)
     {
         $fileNames = $this->getFrontControllerFileNames($env);
@@ -110,13 +116,23 @@ private function findFrontController($documentRoot, $env)
                 return $fileName;
             }
         }
+
+        return null;
     }
 
+    /**
+     * @param string $env
+     *
+     * @return array
+     */
     private function getFrontControllerFileNames($env)
     {
         return ['app_'.$env.'.php', 'app.php', 'index_'.$env.'.php', 'index.php'];
     }
 
+    /**
+     * @return int
+     */
     private function findBestPort()
     {
         $port = 8000;