Changes to make timeliner support date-less log formats #4697

[joachimmetz]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 79.59184% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 85.16%. Comparing base (48f7670) to head (9e376b9).
Report is 1 commits behind head on main.

Files	Patch %	Lines
plaso/engine/timeliner.py	77.41%	7 Missing ⚠️
plaso/containers/events.py	81.25%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4854      +/-   ##
==========================================
+ Coverage   85.14%   85.16%   +0.01%     
==========================================
  Files         427      427              
  Lines       38591    38614      +23     
==========================================
+ Hits        32860    32886      +26     
+ Misses       5731     5728       -3     

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