Generic/MultipleStatementAlignment: false positive with non-scoped control structures

[jrfnl]

Repost from squizlabs/PHP_CodeSniffer#2578:

Ported over from: squizlabs/PHP_CodeSniffer#2529 (comment)

$phrase = 'phrase';
if ($a === true)
    if ($b === true)
        $phrase = 'another phrase';
else
    $phrase = 'different phrase';

Throws:

 3 | WARNING | [x] Equals sign not aligned with surrounding assignments; expected 9
   |         |     spaces but found 1 space
   |         |     (Generic.Formatting.MultipleStatementAlignment.NotSameWarning)
 8 | WARNING | [x] Equals sign not aligned with surrounding assignments; expected 5
   |         |     spaces but found 1 space
   |         |     (Generic.Formatting.MultipleStatementAlignment.NotSameWarning)

Caused by the control structure not having any braces.