Markus Heiser 0052887929 [fix] springer: unsupported operand type(s) for +: 'NoneType' and 'str' ...

- fix issue reported #1809
- filter out `None` value from issn and isbn list
- add comments (from publicationName)
- add publisher

Closes: https://github.com/searxng/searxng/issues/1809
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

2022-09-25 15:25:55 +02:00

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