[Rpm-maint] [rpm-software-management/rpm] Python dist RPM generators errors are silently ignored + local version identifiers fail (#1183)

[Miro Hrončok]

>From https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/thread/JWCV2PG2EG5TCPMJAHWM7B54SMHT6A4V/

And from https://koji.fedoraproject.org/koji/buildinfo?buildID=1495361

The upstream version is "weird". The RPM dist generator fails with:

```
Traceback (most recent call last):
  File "/usr/lib/rpm/pythondistdeps.py", line 379, in <module>
    spec_list.append(convert(name, spec[0], spec[1]))
  File "/usr/lib/rpm/pythondistdeps.py", line 125, in convert
    return OPERATORS[operator](name, operator, version_id)
  File "/usr/lib/rpm/pythondistdeps.py", line 79, in convert_equal
    return '{} = {}'.format(name, version)
  File "/usr/lib/rpm/pythondistdeps.py", line 47, in __str__
    while self.version[-1] == 0:
IndexError: list index out of range
```

The builds goes on.


There are 3 things I'd liek to see fixed:

 - the traceback should say: `Cannot process Python package version: 0+unknown`
 - the build should abort
 - the version is [actually valid](https://www.python.org/dev/peps/pep-0440/#local-version-identifiers)

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