add configuration switch to disable fallback to root directory

[purnhar]

Summary

Skip analysis for projects without source files

Details

If no source files are found in a module of a multi module project, no analysis should be done (e.g. in modules which just assemble war files or docker images). Therefor a the configuration property fallbackToRootDirectory is added to disable the current default behavior.

Context

Feature is needed in bigger Maven multi module projects.

Checklist:

• I've added tests for my code.
• Documentation has been updated accordingly to this PR

Related issue :

closes #66

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3761d67) 75.47% compared to head (8cdcba8) 75.70%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #68      +/-   ##
============================================
+ Coverage     75.47%   75.70%   +0.22%     
  Complexity       33       33              
============================================
  Files             6        6              
  Lines           106      107       +1     
  Branches          6        6              
============================================
+ Hits             80       81       +1     
  Misses           25       25              
  Partials          1        1              

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