R4: ReadTest can fail if no Patient resources on client

[pedro-w]

In the R005 test of the ReadTest, a fatal error can occur:

     ERROR r005_read__summary=text_test: Fatal Error: undefined method `text' for #<FHIR::Bundle:0x000055be105c2168 @id=nil, @meta=nil, @implicitRules=nil, @language=nil, @identifier=nil, @type="searchset", @timestamp=nil, @total=0, @link=[], @entry=[], @signature=nil>
            ----------------------------------------
            /home/p/.rbenv/versions/2.5.8/lib/ruby/gems/2.5.0/gems/fhir_models-4.0.2/lib/fhir_models/bootstrap/model.rb:58:in `method_missing'
            /home/p/plan_executor/lib/tests/suites/read_test.rb:105:in `block in <class:ReadTest>'
            /home/p/plan_executor/lib/tests/suites/base_suite.rb:145:in `instance_eval'

During setup, the code attempts to get a Patient resource from the client under test, otherwise it will create a new one. Unfortunately the created resource is just a local ruby object, it is not created on the client. This causes problems when trying to fetch the resource in test R005 itself.