Setting targeted mode without a panel gives an error message containing null

[SPPearce]

Running the pipeline in targeted mode without specifying --panel gives the following error message:

ERROR ~

  The null is not defined. Currently, the available panels are:
    - tso500

Looking at the code, the first if block was not triggered when it should have done, and so the second was used:

           if (!params.containsKey('panel')) {

                def panels = Constants.PANELS_DEFINED.join('\n    - ')
                log.error "\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n" +
                    "  A panel is required to be set using the --panel CLI argument or in a \n" +
                    "  configuration file.\n" +
                    "  Currently, the available panels are:\n" +
                    "    - ${panels}\n" +
                    "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"
                Nextflow.exit(1)

            } else if (!Constants.PANELS_DEFINED.contains(params.panel)) {

                def panels = Constants.PANELS_DEFINED.join('\n    - ')
                log.error "\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n" +
                    "  The ${params.panel} is not defined. Currently, the available panels are:\n" +
                    "    - ${panels}\n" +
                    "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"
                Nextflow.exit(1)

            }

[scwatts]

Nice catch @SPPearce, thanks for the report!