Fix setting build configuration properties

Author: fealebenpae

lib/pbxProject.js

@@ -681,7 +681,8 @@ pbxProject.prototype.hasFile = function (filePath) {
 // helper recursive prop search+replace
 function propReplace(obj, prop, value) {
     for (var p in obj) {
-        if (obj.hasOwnProperty(p)) {
+        // this is needed because the object could have been created with Object.create(null)
+        if (Object.prototype.hasOwnProperty.call(obj, p)) {
             if (typeof obj[p] == 'object') {
                 propReplace(obj[p], prop, value);
             } else if (p == prop) {