[BRMO-186] Fix BGT updates for Oracle because table_prefix saved as '' is changed to NULL when reading back

[matthijsln]

BRMO-186

[codecov]

Codecov Report

Merging #1436 (fc40570) into master (9de9939) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             master    #1436    +/-   ##
==========================================
  Coverage     35.88%   35.89%            
- Complexity      809     1190   +381     
==========================================
  Files           410      410            
  Lines         19194    19194            
  Branches       1914     1914            
==========================================
+ Hits           6888     6889     +1     
  Misses        11704    11704            
+ Partials        602      601     -1     

Impacted Files	Coverage Δ
...va/nl/b3p/brmo/bgt/loader/cli/DownloadCommand.java	63.11% <100.00%> (ø)
...nl/b3p/brmo/util/http/HttpSeekableByteChannel.java	69.87% <0.00%> (+1.20%)	⬆️

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