[console] Use the description when no help is available

Author: Tristan Darricau

src/Symfony/Component/Console/Command/Command.php

@@ -484,7 +484,7 @@ public function setHelp($help)
      */
     public function getHelp()
     {
-        return $this->help;
+        return $this->help ?: $this->description;
     }
 
     /**

src/Symfony/Component/Console/Tests/Command/CommandTest.php

@@ -131,6 +131,8 @@ public function testGetSetHelp()
         $ret = $command->setHelp('help1');
         $this->assertEquals($command, $ret, '->setHelp() implements a fluent interface');
         $this->assertEquals('help1', $command->getHelp(), '->setHelp() sets the help');
+        $command->setHelp('');
+        $this->assertEquals('description', $command->getHelp(), '->getHelp() fallback to the description');
     }
 
     public function testGetProcessedHelp()

src/Symfony/Component/Console/Tests/Fixtures/application_asxml1.txt

@@ -97,7 +97,7 @@
     <command id="foo:bar" name="foo:bar">
   <usage>foo:bar</usage>
   <description>The foo:bar command</description>
-  <help/>
+  <help>The foo:bar command</help>
   <aliases>
     <alias>afoobar</alias>
   </aliases>

src/Symfony/Component/Console/Tests/Fixtures/application_asxml2.txt

@@ -4,7 +4,7 @@
     <command id="foo:bar" name="foo:bar">
   <usage>foo:bar</usage>
   <description>The foo:bar command</description>
-  <help/>
+  <help>The foo:bar command</help>
   <aliases>
     <alias>afoobar</alias>
   </aliases>