Remove note on difference between microflows and nanoflows in String attributes handling

Author: exec-astraea

content/en/docs/refguide/modeling/application-logic/microflows-and-nanoflows/_index.md

@@ -35,4 +35,3 @@ Below presents a list of main differences between microflows and nanoflows:
 * When used in nanoflow activities, expressions do not support the following objects and variables: `$latestSoapFault`, `$latestHttpResponse`, `$currentSession`, `$currentUser`, `$currentDeviceType`.
 * Nanoflows are not run inside a transaction. So, if an error occurs in a nanoflow, it will not roll back any previous changes.
 * <a id="list-changes-in-sub-nanoflows"></a>Changes done to the lists in a sub-nanoflow are not reflected in the original nanoflow.
-* In nanoflows, when retrieving an `empty` attribute of an object, an empty string (`''`) is returned.