From 8d05e81bd4f7c5f2e8dd9a47af795b3e00c8d4fe Mon Sep 17 00:00:00 2001
From: Robert Korulczyk <robert@korulczyk.pl>
Date: Sun, 18 Jun 2017 17:40:15 +0200
Subject: [PATCH] Fixes #14307: Fixed PHP warning when
 `yii\console\UnknownCommandException` is thrown for empty command

---
 framework/CHANGELOG.md                                         | 1 +
 framework/console/UnknownCommandException.php                  | 2 +-
 ...ommandExceptionTest.php => UnknownCommandExceptionTest.php} | 3 ++-
 3 files changed, 4 insertions(+), 2 deletions(-)
 rename tests/framework/console/{UnkownCommandExceptionTest.php => UnknownCommandExceptionTest.php} (96%)

diff --git a/framework/CHANGELOG.md b/framework/CHANGELOG.md
index e97122470f..e84b0bba55 100644
--- a/framework/CHANGELOG.md
+++ b/framework/CHANGELOG.md
@@ -6,6 +6,7 @@ Yii Framework 2 Change Log
 
 - Bug #14248: `yii\console\controllers\MessageController` no longer outputs colorized filenames when console does not support text colorization (PowerGamer1)
 - Bug #14264: Fixed a bug where `yii\log\Logger::calculateTimings()` was not accepting messages with array tokens (bizley)
+- Bug #14307: Fixed PHP warning when `yii\console\UnknownCommandException` is thrown for empty command (rob006)
 - Chg #14201: `yii\console\controllers\MessageController::extractMessagesFromTokens()` is now protected (faenir)
 - Enh #13787: Added `yii\db\Migration::$maxSqlOutputLength` that allows limiting number of characters for outputting SQL (thiagotalma)
 - Enh #14089: Added tests for `yii\base\Theme` (vladis84)
diff --git a/framework/console/UnknownCommandException.php b/framework/console/UnknownCommandException.php
index eeb9d755f3..1027148aa2 100644
--- a/framework/console/UnknownCommandException.php
+++ b/framework/console/UnknownCommandException.php
@@ -67,7 +67,7 @@ class UnknownCommandException extends Exception
     public function getSuggestedAlternatives()
     {
         $help = $this->application->createController('help');
-        if ($help === false) {
+        if ($help === false || $this->command === '') {
             return [];
         }
         /** @var $helpController HelpController */
diff --git a/tests/framework/console/UnkownCommandExceptionTest.php b/tests/framework/console/UnknownCommandExceptionTest.php
similarity index 96%
rename from tests/framework/console/UnkownCommandExceptionTest.php
rename to tests/framework/console/UnknownCommandExceptionTest.php
index 6d743eca8a..2e3369c4a3 100644
--- a/tests/framework/console/UnkownCommandExceptionTest.php
+++ b/tests/framework/console/UnknownCommandExceptionTest.php
@@ -14,7 +14,7 @@ use yiiunit\TestCase;
 /**
  * @group console
  */
-class UnkownCommandExceptionTest extends TestCase
+class UnknownCommandExceptionTest extends TestCase
 {
     public function setUp()
     {
@@ -42,6 +42,7 @@ class UnkownCommandExceptionTest extends TestCase
             ['cach/fush', ['cache/flush']],
             ['cach/fushall', ['cache/flush-all']],
             ['what?', []],
+            ['', []],
             // test UTF 8 chars
             ['ёлка', []],
             // this crashes levenshtein because string is longer than 255 chars