* #709 Return empty response for empty mappings and no applied aliases

[goyamegh]

Description

Returns an empty response instead of exception in case of:

1. empty index mappings are present,
2. no applied aliases are present on the index

Issues Resolved

#709

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

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[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (cd23067) 28.17% compared to head (456ce10) 28.13%.

Files	Patch %	Lines
...ch/securityanalytics/mapper/MappingsTraverser.java	75.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.7     #765      +/-   ##
============================================
- Coverage     28.17%   28.13%   -0.04%     
  Complexity      895      895              
============================================
  Files           231      231              
  Lines          9343     9343              
  Branches       1075     1075              
============================================
- Hits           2632     2629       -3     
- Misses         6474     6477       +3     
  Partials        237      237              

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