merged branch pvolok/fix-7274 (PR #7641)

This PR was merged into the 2.1 branch.

Discussion
----------

[2.2][Yaml] Fixed resolving blank values

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #7274
| License       | MIT
| Doc PR        | -

Also, Seldaek suggested to rename the $notEOF variable.

Commits
-------

fb686d8 [Yaml] improved boolean naming ($notEOF -> !$EOF)
047212a [Yaml] fixed handling an empty value

src/Symfony/Component/Yaml/Parser.php

@@ -102,7 +102,7 @@ class Parser
                         $parser->refs =& $this->refs;
 
                         $block = $values['value'];
-                        if (!$this->isNextLineIndented()) {
+                        if ($this->isNextLineIndented()) {
                             $block .= "\n".$this->getNextEmbedBlock($this->getCurrentLineIndentation() + 2);
                         }
 
@@ -174,7 +174,7 @@ class Parser
                 // hash
                 } elseif (!isset($values['value']) || '' == trim($values['value'], ' ') || 0 === strpos(ltrim($values['value'], ' '), '#')) {
                     // if next line is less indented or equal, then it means that the current value is null
-                    if ($this->isNextLineIndented() && !$this->isNextLineUnIndentedCollection()) {
+                    if (!$this->isNextLineIndented() && !$this->isNextLineUnIndentedCollection()) {
                         $data[$key] = null;
                     } else {
                         $c = $this->getRealCurrentLineNb() + 1;
@@ -482,18 +482,18 @@ class Parser
     private function isNextLineIndented()
     {
         $currentIndentation = $this->getCurrentLineIndentation();
-        $notEOF = $this->moveToNextLine();
+        $EOF = !$this->moveToNextLine();
 
-        while ($notEOF && $this->isCurrentLineEmpty()) {
-            $notEOF = $this->moveToNextLine();
+        while (!$EOF && $this->isCurrentLineEmpty()) {
+            $EOF = !$this->moveToNextLine();
         }
 
-        if (false === $notEOF) {
+        if ($EOF) {
             return false;
         }
 
         $ret = false;
-        if ($this->getCurrentLineIndentation() <= $currentIndentation) {
+        if ($this->getCurrentLineIndentation() > $currentIndentation) {
             $ret = true;
         }
 

src/Symfony/Component/Yaml/Tests/ParserTest.php

@@ -492,6 +492,15 @@ yaml:
 EOF
         );
     }
+
+    public function testEmptyValue()
+    {
+        $input = <<<EOF
+hash:
+EOF;
+
+        $this->assertEquals(array('hash' => null), Yaml::parse($input));
+    }
 }
 
 class B