fdo#75582: Handle MalformedUriException

Cherry-picks from master 29c3bb0968cb9770f7b822f5cf466314be9db825 "Handle
vnd.sun.star.Package: URLs provoking MalrformedUriException,"
eaa876e48695e7927563ee56a08e11acb0036e4a "typo in comment," and
33ca98314133a93e71edb1a003fe8ddb7b36e8a9 "Catching MalformedUriException
subsumes the rPath.isEmpty() case now," which are based on master-only
87432aeecdfa7194bb5050f912656e03294cf6c7 "Resolves: #i123042# corrected reload
of linked content..." but which is not needed to fix this issue.

Conflicts:
	svgio/source/svgreader/svgimagenode.cxx

Change-Id: I68ea3410be2f758c869ef284718ccf139f1c9b78
Reviewed-on: https://gerrit.libreoffice.org/8399
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>