fix bug with null values for array binding fields

Author: fetzi

src/Bindings/ArrayBinding.php

@@ -60,11 +60,13 @@ public function bind($jsonDecoder, $jsonData, $propertyAccessor)
         $data = $jsonData[$this->jsonField];
         $values = [];
 
-        foreach ($data as $item) {
-            $values[] = $jsonDecoder->decodeArray($item, $this->type);
-        }
+        if (is_array($data)) {
+            foreach ($data as $item) {
+                $values[] = $jsonDecoder->decodeArray($item, $this->type);
+            }
 
-        $propertyAccessor->set($values);
+            $propertyAccessor->set($values);
+        }
     }
 
     /**

tests/specs/Bindings/ArrayBindingSpec.php

@@ -7,6 +7,7 @@
 use Karriere\JsonDecoder\JsonDecoder;
 use Karriere\JsonDecoder\PropertyAccessor;
 use PhpSpec\ObjectBehavior;
+use Prophecy\Argument;
 
 class ArrayBindingSpec extends ObjectBehavior
 {
@@ -36,6 +37,13 @@ public function it_should_decode_the_array(JsonDecoder $jsonDecoder, PropertyAcc
 
         $this->bind($jsonDecoder, ['field' => [[], []]], $propertyAccessor);
     }
+
+    public function it_should_ignore_null_values(JsonDecoder $jsonDecoder, PropertyAccessor $propertyAccessor)
+    {
+        $jsonDecoder->decodeArray(Argument::any(), Argument::any())->shouldNotBeCalled();
+
+        $this->bind($jsonDecoder, ['field' => null], $propertyAccessor);
+    }
 }
 
 class Sample