Warning for domain name

[kentr0w]

Actions checklist

• Implemented Rule, added Warnings
• Added tests on checks
• Updated diktat-analysis.yml
• Updated available-rules.md
• closes Handle case when domainName is empty in config #678

[codecov]

Codecov Report

Merging #696 (ac2db15) into master (0b61701) will decrease coverage by 0.00%.
The diff coverage is 63.63%.

@@             Coverage Diff              @@
##             master     #696      +/-   ##
============================================
- Coverage     80.11%   80.10%   -0.01%     
- Complexity     1893     1894       +1     
============================================
  Files            90       90              
  Lines          4909     4912       +3     
  Branches       1573     1575       +2     
============================================
+ Hits           3933     3935       +2     
- Misses          238      239       +1     
  Partials        738      738              

Flag	Coverage Δ	Complexity Δ
unittests	80.10% <63.63%> (-0.01%)	0.00 <0.00> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ	Complexity Δ
...fn/diktat/common/config/rules/RulesConfigReader.kt	31.03% <0.00%> (ø)	4.00 <0.00> (ø)
...fn/diktat/ruleset/rules/files/FileStructureRule.kt	81.30% <57.14%> (+0.30%)	63.00 <0.00> (+1.00)
...lin/org/cqfn/diktat/ruleset/rules/PackageNaming.kt	91.76% <76.92%> (-1.10%)	35.00 <0.00> (ø)

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[petertrr]

lgtm