[Rpm-maint] [rpm-software-management/rpm] Improve error message for Source URLs lacking tarball name (#238)

[Chris Horsley]

I was using rpmbuild to create Python RPMs based on a local tarball. I would receive this somewhat cryptic error:

```error: File /home/makerpm/rpmbuild/SOURCES: Is a directory```

After digging through the rpmbuild code for hints, it turned out that where py2pack (which I used for generating spec files) produced a spec file header of:

```Source:         https://files.pythonhosted.org/packages/source/m/mixbox/```

I needed:

```Source:         https://files.pythonhosted.org/packages/source/m/mixbox/mixbox-%{version}.tar.gz```

It was not obvious to me that the name of the tarball in fact needed to be in the external URL when I was building everything locally. I'd like to suggest a more explicit error if the version / tarball name cannot be extracted from the Source field.

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