Not all RPM data are collected

### Description
Using ftp://ftp.ntua.gr/pub/linux/fedora/linux/updates/32/Everything/SRPMS/Packages/z/zathura-0.4.5-1.fc32.src.rpm I have these data:
```
$ rpm -qpi zathura-0.4.5-1.fc32.src.rpm
warning: zathura-0.4.5-1.fc32.src.rpm: Header V3 RSA/SHA256 Signature, key ID 12c944d0: NOKEY
Name : zathura
Version : 0.4.5
Release : 1.fc32
Architecture: armv7hl
Install Date: (not installed)
Group : Unspecified
Size : 165347
License : zlib
Signature : RSA/SHA256, Wed 15 Apr 2020 10:24:47 PM CEST, Key ID 6c13026d12c944d0
Source RPM : (none)
Build Date : Wed 15 Apr 2020 06:05:20 PM CEST
Build Host : buildvm-armv7-06.arm.fedoraproject.org
Relocations : (not relocatable)
Packager : Fedora Project
Vendor : Fedora Project
URL : http://pwmt.org/projects/zathura/
Bug URL : https://bugz.fedoraproject.org/zathura
Summary : A lightweight document viewer
Description :
Zathura is a highly customizable and functional document viewer.
It provides a minimalistic and space saving interface as well as
an easy usage that mainly focuses on keyboard interaction.

Zathura requires plugins to support document formats.
For instance:
* zathura-pdf-poppler to open PDF files,
* zathura-ps to open PostScript files,
* zathura-djvu to open DjVu files, or
* zathura-cb to open comic book files.

All of these are available as separate packages in Fedora.
A zathura-plugins-all package is available should you want
to install all available plugins.
```
but with scancode (latest develop) I get this:
```
$ scancode -p --json-pp - zathura-0.4.5-1.fc32.src.rpm
8<......clip................
"files": [
{
"path": "zathura-0.4.5-1.fc32.src.rpm",
"type": "file",
"packages": [
{
"type": "rpm",
"namespace": null,
"name": "zathura",
"version": "0.4.5-1.fc32",
"qualifiers": {},
"subpath": null,
"primary_language": null,
"description": "A lightweight document viewer\nZathura is a highly customizable and functional document viewer.\nIt provides a minimalistic and space saving interface as well as\nan easy usage that mainly focuses on keyboard interaction.\n\nZathura requires plugins to support document formats.\nFor instance:\n* zathura-pdf-poppler to open PDF files,\n* zathura-ps to open PostScript files,\n* zathura-djvu to open DjVu files, or\n* zathura-cb to open comic book files.\n\nAll of these are available as separate packages in Fedora.\nA zathura-plugins-all package is available should you want\nto install all available plugins.",
"release_date": null,
"parties": [
{
"type": null,
"role": "distributor",
"name": "Fedora Project",
"email": null,
"url": null
},
{
"type": null,
"role": "vendor",
"name": "Fedora Project",
"email": null,
"url": null
}
],
"keywords": [],
"homepage_url": "http://pwmt.org/projects/zathura/",
"download_url": null,
"size": null,
"sha1": null,
"md5": null,
"sha256": null,
"sha512": null,
"bug_tracking_url": null,
"code_view_url": null,
"vcs_url": null,
"copyright": null,
"license_expression": "zlib",
"declared_license": "zlib",
"notice_text": null,
"root_path": null,
"dependencies": [],
"contains_source_code": null,
"source_packages": [],
"purl": "pkg:rpm/zathura@0.4.5-1.fc32",
"repository_homepage_url": null,
"repository_download_url": null,
"api_data_url": null
}
],
"scan_errors": []
}
]
}
```
I am missing:
- `bug_tracking_url`
- a `qualifier` that this is an src rpm
- a `qualifier` for the architecture `armv7hl`
- the `size`
- I am not sure `Group` is correctly mapped to keywords
- same for `Packager` ... it should be a party when present. It is collected here, but may be not in this ftp://ftp.pbone.net/mirror/ftp.centos.org/7.7.1908/cr/x86_64/Packages/389-ds-base-snmp-1.3.10.1-5.el7.x86_64.rpm ?
- possibly some extra data for these build fields? (TBD)
```
Build Date : Wed 15 Apr 2020 06:05:20 PM CEST
Build Host : buildvm-armv7-06.arm.fedoraproject.org
```