update: do not die when androguard files to extract icon
update: do not die when androguard files to extract icon

https://jenkins.debian.net/job/reproducible_fdroid_test/422
https://jenkins.debian.net/job/reproducible_fdroid_test/423

```
Traceback (most recent call last):
  File "../fdroid", line 22, in <module>
    fdroidserver.__main__.main()
  File "/var/lib/jenkins/userContent/reproducible/reproducible_fdroid_build_apps/fdroidserver/__main__.py", line 227, in main
    raise e
  File "/var/lib/jenkins/userContent/reproducible/reproducible_fdroid_build_apps/fdroidserver/__main__.py", line 208, in main
    mod.main()
  File "/var/lib/jenkins/userContent/reproducible/reproducible_fdroid_build_apps/fdroidserver/update.py", line 2316, in main
    apks, cachechanged = process_apks(apkcache, repodirs[0], knownapks, options.use_date_from_apk)
  File "/var/lib/jenkins/userContent/reproducible/reproducible_fdroid_build_apps/fdroidserver/update.py", line 1746, in process_apks
    use_date_from_apk, ada, True)
  File "/var/lib/jenkins/userContent/reproducible/reproducible_fdroid_build_apps/fdroidserver/update.py", line 1619, in process_apk
    apk = scan_apk(apkfile)
  File "/var/lib/jenkins/userContent/reproducible/reproducible_fdroid_build_apps/fdroidserver/update.py", line 1385, in scan_apk
    scan_apk_androguard(apk, apk_file)
  File "/var/lib/jenkins/userContent/reproducible/reproducible_fdroid_build_apps/fdroidserver/update.py", line 1527, in scan_apk_androguard
    resource_id = arsc.get_id(apk['packageName'], icon_id)
  File "/usr/lib/python3/dist-packages/androguard/core/bytecodes/axml/__init__.py", line 1668, in get_id
    self._analyse()
  File "/usr/lib/python3/dist-packages/androguard/core/bytecodes/axml/__init__.py", line 1321, in _analyse
    ate = self.packages[package_name][nb + 3 + nb_i]
IndexError: list index out of range

```

f-droid/fdroidserver,f-droid/fdroid-server,fdroidtravis/fdroidserver,f-droid/fdroid-server,f-droid/fdroidserver,f-droid/fdroid-server,fdroidtravis/fdroidserver,fdroidtravis/fdroidserver,fdroidtravis/fdroidserver,f-droid/fdroidserver,f-droid/fdroidserver,f-droid/fdroid-server,f-droid/fdroid-server,f-droid/fdroidserver