Fixes #6919, do not check for host in regex group in log importer if format has no regex. Also add nginx json log to log importer system test.

1 files changed, 1 insertions, 1 deletions

diff --git a/misc/log-analytics/import_logs.py b/misc/log-analytics/import_logs.py
index bf3515d49e..ec507a0048 100755
--- a/misc/log-analytics/import_logs.py
+++ b/misc/log-analytics/import_logs.py
@@ -1231,7 +1231,7 @@ class DynamicResolver(object):
     def check_format(self, format):
         if config.options.replay_tracking:
             pass
-        elif 'host' not in format.regex.groupindex and not config.options.log_hostname:
+        elif format.regex is not None and 'host' not in format.regex.groupindex and not config.options.log_hostname:
             fatal_error(
                 "the selected log format doesn't include the hostname: you must "
                 "specify the Piwik site ID with the --idsite argument"