Avoid DNU when using an API client with a relative URL

[gcotelli]

No description provided.

[codecov]

Codecov Report

Merging #54 (733fc9f) into release-candidate (7f64b21) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@                  Coverage Diff                  @@
##           release-candidate      #54      +/-   ##
=====================================================
- Coverage              99.63%   99.63%   -0.01%     
=====================================================
  Files                     53       53              
  Lines                   2999     2997       -2     
=====================================================
- Hits                    2988     2986       -2     
  Misses                    11       11              

Impacted Files	Coverage Δ
...del-Tests/CompositeHttpRequestCommandTest.class.st	100.00% <100.00%> (ø)
...API-Tests/RESTfulAPIClientIntegrationTest.class.st	100.00% <100.00%> (ø)
...nal-RESTfulAPI-Tests/RESTfulAPIClientTest.class.st	100.00% <100.00%> (ø)
.../Superluminal-RESTfulAPI/RESTfulAPIClient.class.st	100.00% <100.00%> (ø)
...onsulAgentHttpAPIBasedDiscoveryClientTest.class.st	100.00% <100.00%> (ø)

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