add comments and remove native in-mem caching

ios/CodePush/CodePush.m

@@ -447,6 +447,9 @@ RCT_EXPORT_METHOD(getConfiguration:(RCTPromiseResolveBlock)resolve
         }
         
         if (binaryHash == nil) {
+            // The hash was not generated either due to a previous unknown error or the fact that
+            // the React Native assets were not bundled in the binary (e.g. during dev/simulator)
+            // builds.
             resolve(configuration);
             return;
         }