Expose exceptions in DumpProcessingController

[wetneb]

Those are the changes proposed by @brett-matson in #523, minus the unrelated commits.

[codecov[bot]]

Codecov Report

Merging #526 (3406b6a) into master (d6cecbd) will increase coverage by 0.04%. The diff coverage is 0.00%.

:exclamation: Current head 3406b6a differs from pull request most recent head b38cd5e. Consider uploading reports for the commit b38cd5e to get more accurate results

@@             Coverage Diff              @@
##             master     #526      +/-   ##
============================================
+ Coverage     81.02%   81.07%   +0.04%     
- Complexity     2085     2128      +43     
============================================
  Files           149      148       -1     
  Lines          7293     7354      +61     
  Branches        895      902       +7     
============================================
+ Hits           5909     5962      +53     
- Misses         1115     1122       +7     
- Partials        269      270       +1     

Impacted Files	Coverage Δ	Complexity Δ
...idata/wdtk/dumpfiles/DumpProcessingController.java	61.90% <0.00%> (-3.92%)	32.00 <0.00> (ø)
...kidata/wdtk/datamodel/implementation/TermImpl.java	71.42% <0.00%> (-11.91%)	5.00% <0.00%> (ø%)
...a/wdtk/datamodel/interfaces/StatementDocument.java	68.35% <0.00%> (-3.65%)	45.00% <0.00%> (ø%)
...org/wikidata/wdtk/datamodel/helpers/Datamodel.java	87.71% <0.00%> (-2.85%)	47.00% <0.00%> (+2.00%)	:arrow_down:
...a/wdtk/datamodel/implementation/StatementImpl.java	93.33% <0.00%> (-0.18%)	23.00% <0.00%> (-1.00%)
...a/org/wikidata/wdtk/wikibaseapi/ApiConnection.java	90.29% <0.00%> (ø)	41.00% <0.00%> (ø%)
...org/wikidata/wdtk/wikibaseapi/StatementUpdate.java	84.54% <0.00%> (ø)	64.00% <0.00%> (ø%)
...kidata/wdtk/datamodel/implementation/SnakImpl.java	100.00% <0.00%> (ø)	5.00% <0.00%> (+1.00%)
...idata/wdtk/datamodel/helpers/JsonDeserializer.java	95.23% <0.00%> (ø)	6.00% <0.00%> (ø%)
...idata/wdtk/datamodel/implementation/ValueImpl.java	97.36% <0.00%> (ø)	2.00% <0.00%> (ø%)
... and 11 more

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