Fix formatting of decimal values when there is no fractionSymbol.

When a currency format does not include a fractionSymbol it should be
able to format fractional values.

Fixes #2253

lib/Cake/Test/Case/Utility/CakeNumberTest.php

@@ -335,6 +335,19 @@ class CakeNumberTest extends CakeTestCase {
 		$this->assertEquals($expected, $result);
 	}
 
+/**
+ * Test that the default fraction handling does not cause issues.
+ *
+ * @return void
+ */
+	public function testCurrencyFractionSymbol() {
+		$result = $this->Number->currency(0.2, '', array(
+			'places' => 2,
+			'decimal' => '.'
+		));
+		$this->assertEquals('0.2', $result);
+	}
+
 /**
  * Test adding currency format options to the number helper
  *

lib/Cake/Utility/CakeNumber.php

@@ -75,7 +75,7 @@ class CakeNumber {
  * @var array
  */
 	protected static $_currencyDefaults = array(
-		'wholeSymbol' => '', 'wholePosition' => 'before', 'fractionSymbol' => '', 'fractionPosition' => 'after',
+		'wholeSymbol' => '', 'wholePosition' => 'before', 'fractionSymbol' => false, 'fractionPosition' => 'after',
 		'zero' => '0', 'places' => 2, 'thousands' => ',', 'decimals' => '.', 'negative' => '()', 'escape' => true,
 		'fractionExponent' => 2
 	);