PyBuild: Bad exception handling

[jrolli]

Error on loading the builder class trips a secondary error in pybuild.py itself:

Traceback (most recent call last):
  File "pybuild.py", line 10, in <module>
    import build
ModuleNotFoundError: No module named 'build'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "pybuild.py", line 12, in <module>
    except e:
NameError: name 'e' is not defined