only move GPG signature if APK exists
only move GPG signature if APK exists

The .asc moving code just needed to be indented so it only runs when
'srcname' exists in apk[], otherwise it just throws a KeyError

fdroidtravis/fdroidserver,matlink/fdroidserver,f-droid/fdroidserver,matlink/fdroidserver,f-droid/fdroid-server,OneEducation/AppUniverse_Server,OneEducation/AppUniverse_Server,OneEducation/AppUniverse_Server,fdroidtravis/fdroidserver,f-droid/fdroid-server,OneEducation/AppUniverse_Server,fdroidtravis/fdroidserver,fdroidtravis/fdroidserver,matlink/fdroidserver,OneEducation/AppUniverse_Server,f-droid/fdroid-server,f-droid/fdroid-server,f-droid/fdroidserver,matlink/fdroidserver,matlink/fdroidserver,f-droid/fdroidserver,f-droid/fdroidserver,f-droid/fdroid-server,f-droid/fdroidserver