backend: fix logging traceback
Traceback (most recent call last):
File "/usr/lib/python3.9/site-packages/copr_backend/actions.py", line 456, in run
self.log.info(mmd_yaml)
File "/usr/lib64/python3.9/logging/__init__.py", line 1446, in info
self._log(INFO, msg, args, **kwargs)
File "/usr/lib64/python3.9/logging/__init__.py", line 1589, in _log
self.handle(record)
File "/usr/lib64/python3.9/logging/__init__.py", line 1599, in handle
self.callHandlers(record)
File "/usr/lib64/python3.9/logging/__init__.py", line 1661, in callHandlers
hdlr.handle(record)
File "/usr/lib64/python3.9/logging/__init__.py", line 952, in handle
self.emit(record)
File "/usr/lib/python3.9/site-packages/copr_backend/helpers.py", line 440, in emit
record.msg = record.msg % record.args
TypeError: not enough arguments for format string
Merges: #1815