Changed so groups are only generated, if a group comprises of more than one test. This was necessary, because by default the constructor in EnsTestCase adds each test into a group with its own short name.
Changed so groups are only generated, if a group comprises of more than one test. This was necessary, because by default the constructor in EnsTestCase adds each test into a group with its own short name.

thomasmaurel/ensj-healthcheck,Ensembl/ensj-healthcheck,Ensembl/ensj-healthcheck,thomasmaurel/ensj-healthcheck,thomasmaurel/ensj-healthcheck,Ensembl/ensj-healthcheck,Ensembl/ensj-healthcheck,thomasmaurel/ensj-healthcheck