StaticResolver contains list

[fwrite]

A fixed site id resulted in an AttributeError: 'list' object has no attribute 'get' exception.
The parameters:

python3 import_logs.py --url 'https://matomo-url.example' --token-auth 8d... --idsite 20 --log-format-name=ncsa_extended --show-progress --debug --debug-tracker /tmp/access.log.1

Reason:
The variable site in StaticResolver is a list of length 1, instead of a dictionary.

matomo-log-analytics/import_logs.py

Line 1646 in 5a1f5f8

if site.get('result') == 'error':

Quick 'n dirty fix:
Add site = site[0] before.

Less quick, still a bit dirty:

        if len(site) > 1:
            fatal_error(
                "cannot find unique site with this id"
            )
        elif len(site) < 1:
            fatal_error(
                "did not find a site with siteid {:s}".format(self.site_id)
            )
        else:
            site = site[0]

[fwrite]

This appears to be a duplicate of #268.