Proposed fix for issue 590

Reset keyRedaction variable so that the parent's keyRedaction will not be carried onto its children which used to cause the key to be an empty array inside the ngModel builder.

Author: elbunuelo

src/services/builder.js

@@ -133,7 +133,7 @@ angular.module('schemaForm').provider('sfBuilder', ['sfPathProvider', function(s
       var items = args.fieldFrag.querySelector('[schema-form-array-items]');
       if (items) {
         state = angular.copy(args.state);
-        state.keyRedaction = state.keyRedaction || 0;
+        state.keyRedaction = 0;
         state.keyRedaction += args.form.key.length + 1;
 
         // Special case, an array with just one item in it that is not an object.