## Description: * The user factory currently commits a value to every single field. * This means that many values get a value equal to a blank string, which is different from 'Null'. * Email and RFID must either be Null or a Unique value. * The factory forces Email and RFID to be not Null. * Attempting to enter no value means that it has a value of ```''``` * This is inevitably not a unique value * The sql commit fails ## Components Affected * ```users.py/user_input()``` * ```users.py/user_input()/user_data``` ## Proposed Solution * [ ] check whether a non-blank value has been entered for RFID and Email * [ ] If a non-blank value is entered, re-assign value to ```None```, the python indicator of ```Null```
