CodeBuilder chokes on input plugin

[ltalirz]

Describe the bug

In aiida 1.6.8, got an error when trying to use the CodeBuilder (same code worked fine in 2.0).

The error was here: https://github.com/aiidateam/aiida-core/blob/65f7ff8dee171fb158692455be5d25ddc67c0ee5/aiida/orm/utils/builders/code.py#L67

self._get_and_count('input_plugin', used) returned a string (e.g. 'quantumespresso.pw'), which has no .name attribute.

Removing the .name fixed the issue.

Your environment

• Operating system [e.g. Linux]: ubuntu 20.04
• Python version [e.g. 3.7.1]: 3.8
• aiida-core version [e.g. 1.2.1]: 1.6.8

[ltalirz]

The error in the PR seems to indicate that self._get_and_count('input_plugin', used) can return an entry point or a string, depending on circumstances. A proper fix will need to take both into account.

[sphuber]

Note that the code builder has been deprecated and this will be removed at some point