[Rpm-maint] [rpm-software-management/rpm] Only destroy lua tables if there are no BASpecs left (#366)

[Nikola Forró]

> Does this fix a concrete bug you're encountering?

Yes. Imagine the following spec file called `reproducer.spec`:

```specfile
Name:		reproducer
Version:	0.1
Release:	1%{?dist}
Summary:	reproducer spec file

License:	GPL
URL:		file:///dev/null
Source0:	file:///dev/null

BuildArch: 	noarch

%description
reproducer spec file

%prep

%build

%install

%files

%changelog
* Mon Feb 05 2018 Nikola Forró <nforro at redhat.com> - 0.1-1
- create reproducer spec file
```

And the following python snippet:

```python
import rpm

spec = rpm.spec('reproducer.spec')
print(rpm.expandMacro('%{lua: print(sources)}'))
```

The result is `nil` instead of a lua table. If you remove `BuildArch` from the spec file, it works as expected.

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