Fix min/maxProperties check for invalid array input

Author: integer

src/JsonSchema/Constraints/TypeCheck/StrictTypeCheck.php

@@ -31,6 +31,10 @@ public static function propertyExists($value, $property)
 
     public static function propertyCount($value)
     {
+        if (!is_object($value)) {
+            return 0;
+        }
+
         return count(get_object_vars($value));
     }
 }

tests/Constraints/MinMaxPropertiesTest.php

@@ -123,6 +123,16 @@ public function getInvalidTests()
                   }
                 }'
             ),
+            array(
+                '{
+                  "value": []
+                }',
+                '{
+                  "properties": {
+                    "value": {"minProperties": 1,"maxProperties": 2}
+                  }
+                }'
+            ),
         );
     }
 }