Fix failure on missing server value in getTemporalData

[ganisimov]

When connection details is set up using Connection String, server value is NULL. It caused failure on attempt to extract dbName from server.
Now, dbName is set to NA if server is not provided (new behavior) as well as when it doesn't contain slash character ("/") (existent behavior)

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 0.00%. Comparing base (5fdd05c) to head (c7cd126).

Files	Patch %	Lines
R/getTemporalData.r	0.00%	5 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #760       +/-   ##
===========================================
- Coverage    12.74%   0.00%   -12.75%     
===========================================
  Files           14      14               
  Lines         3649    3651        +2     
===========================================
- Hits           465       0      -465     
- Misses        3184    3651      +467     

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