Return an INFO string if log file does not yet exist

[ghost]

Closes #2090

[codecov-commenter]

Codecov Report

Merging #2100 (9058666) into develop (5328544) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           develop    #2100      +/-   ##
===========================================
- Coverage    76.04%   76.04%   -0.01%     
===========================================
  Files          434      434              
  Lines        23218    23219       +1     
  Branches      3104     3104              
===========================================
  Hits         17657    17657              
- Misses        4852     4853       +1     
  Partials       709      709              

Impacted Files	Coverage Δ
intelmq/bin/intelmqctl.py	9.32% <0.00%> (-0.02%)	⬇️
intelmq/bots/collectors/http/collector_http.py	59.61% <ø> (ø)
...elmq/bots/collectors/http/collector_http_stream.py	40.00% <ø> (ø)
intelmq/bots/collectors/misp/collector.py	41.86% <ø> (ø)
...s/collectors/shadowserver/collector_reports_api.py	89.28% <ø> (ø)
intelmq/bots/experts/http/expert_status.py	80.00% <ø> (ø)
intelmq/bots/experts/jinja/expert.py	39.39% <ø> (ø)
intelmq/bots/experts/splunk_saved_search/expert.py	20.75% <ø> (ø)
intelmq/bots/experts/tuency/expert.py	86.00% <ø> (ø)
intelmq/bots/outputs/elasticsearch/output.py	78.04% <ø> (ø)
... and 11 more