#1 Duplicate module names can be added

[Eduard Oajdea]

In the list of modules from the admin portal 2 or mode modules can share the same name.
Steps to reproduce:
1. Go to admin portal web page
2. Input valid values for username and password
3. Press the login button
4. Press the add module link
5. Input in the name field a name that exists in the list of modules
6. Input 60 in the auto update interval input
7. Select “Local” from the dropdown input
8. Input a valid path from your file system of a directory with java files
9. Press the add button
Expected result: show a validation message in order to prevent modules with duplicate names to be added.
Actual result: the module is added successfully to the list of modules.

[Eduard Oajdea]

the modules page with 2 modules that share the same name